Slickdeals is community-supported.  We may get paid by brands for deals, including promoted items.
frontpagePennyFound | Staff posted Yesterday 06:41 AM
  1. Deal Image
Item 1 of 3
  1. Deal Image
  2. Deal Image
  3. Deal Image
Item 1 of 3
frontpagePennyFound | Staff posted Yesterday 06:41 AM

Cooler Master MasterBox Q300L microATX Tower PC Case w/ Magnetic Dust Filter

+ Free S&H

$35

$45

22% off
Amazon
9 Comments 4,150 Views
Get Deal at Amazon
Good Deal
Save
Share
Deal Details
Amazon has Cooler Master MasterBox Q300L microATX Tower Computer Case with Magnetic Design Dust Filter (MCB-Q300L-KANN-S00) on sale for $39.99 - $5 when you 'clip' the coupon on the product page = $34.99. Shipping is free.

Thanks to Deal Hunter PennyFound for sharing this deal.

Note: You must be logged in to clip coupons; coupons are typically for one-time use.

Product Details:
  • Ample Interior: Explore ample interior space for Micro-ATX or Mini-ITX motherboards, ensuring easy and future expansion
  • Components Clearance: Accommodates CPU coolers with a max height of 159mm, GPU cards up to 360mm, and PSU up to 160mm in length.
  • Versatile Cooling: Maximize cooling performance with a 240mm liquid cooler and 5 fans.
  • Modular I/O Panel: You have the flexibility to adjust its position at the front, top, or bottom on both sides
  • Edge-To-Edge Panel: Show off your meticulous build through the transparent side panel with pride.
  • Open Thermal Design: The perforated design on all sides promotes optimal airflow and heat dissipation
  • Magnetic Dust Filters: The unique pattern of the dust filter adds a distinctive appearance to the case.

Editor's Notes

Written by Nate650 | Staff
  • About this deal:
    • Our research indicates that this deal is $5 less (12.5% savings) than the next best available price from a reputable merchant with prices starting from $39.99 at the time of this post.
  • About this product:
  • About this store:

Original Post

Written by PennyFound | Staff
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Amazon has Cooler Master MasterBox Q300L microATX Tower Computer Case with Magnetic Design Dust Filter (MCB-Q300L-KANN-S00) on sale for $39.99 - $5 when you 'clip' the coupon on the product page = $34.99. Shipping is free.

Thanks to Deal Hunter PennyFound for sharing this deal.

Note: You must be logged in to clip coupons; coupons are typically for one-time use.

Product Details:
  • Ample Interior: Explore ample interior space for Micro-ATX or Mini-ITX motherboards, ensuring easy and future expansion
  • Components Clearance: Accommodates CPU coolers with a max height of 159mm, GPU cards up to 360mm, and PSU up to 160mm in length.
  • Versatile Cooling: Maximize cooling performance with a 240mm liquid cooler and 5 fans.
  • Modular I/O Panel: You have the flexibility to adjust its position at the front, top, or bottom on both sides
  • Edge-To-Edge Panel: Show off your meticulous build through the transparent side panel with pride.
  • Open Thermal Design: The perforated design on all sides promotes optimal airflow and heat dissipation
  • Magnetic Dust Filters: The unique pattern of the dust filter adds a distinctive appearance to the case.

Editor's Notes

Written by Nate650 | Staff
  • About this deal:
    • Our research indicates that this deal is $5 less (12.5% savings) than the next best available price from a reputable merchant with prices starting from $39.99 at the time of this post.
  • About this product:
  • About this store:

Original Post

Written by PennyFound | Staff

Community Voting

Deal Score
+28
Good Deal
Get Deal at Amazon

Price Intelligence

Model: Cooler Master MasterBox Q300L Micro-ATX Tower with Magnetic Design Dust Filter, Transparent Acrylic Side Panel, Adjustable I/O & Fully Ventilated Airflow, Black (MCB-Q300L-KANN-S00)

Deal History 

Sale Price
Slickdeal
  • $NaN
  • Today

Current Prices

Sort: Lowest to Highest | Last Updated 5/15/2026, 02:56 AM
Sold By Sale Price
Amazon$39.99

Leave a Comment

Unregistered (You)

Top Comments

GrandmasterBBC
2317 Posts
309 Reputation
If you are on a strict budget then this case certainly gets the job done. However, I despise the acrylic side panel. Those things get scratched up just by looking at them. I wish Cooler Master could offer the v2 version with tempered side panel glass for less than $62.

9 Comments

Sign up for a Slickdeals account to remove this ad.

Yesterday 04:58 PM
2,317 Posts
Joined Nov 2011
GrandmasterBBCYesterday 04:58 PM
2,317 Posts

Our community has rated this post as helpful. If you agree, why not thank GrandmasterBBC

If you are on a strict budget then this case certainly gets the job done. However, I despise the acrylic side panel. Those things get scratched up just by looking at them. I wish Cooler Master could offer the v2 version with tempered side panel glass for less than $62.
1
1
Yesterday 05:47 PM
12,600 Posts
Joined Nov 2010
PeteyTheStrikerYesterday 05:47 PM
12,600 Posts
I have the Asus TUFF version of this case. Have been using it for about 5 years now. Overall a great case with many options and space for install. Only thing that is annoying is that if you have a large graphics card RTX 3080 or above and you use front mounts for cooling AIO space will become very tight. In most cases installing and uninstalling the graphics card for maintenance and cleaning becomes a pain cause its just a tight fit. Besides that, I paid double this price and have been overall happy with the case.
1
Yesterday 08:12 PM
188 Posts
Joined Dec 2005
punkdigeratiYesterday 08:12 PM
188 Posts

Our community has rated this post as helpful. If you agree, why not thank punkdigerati

I would consider the cost of adding enough fans to get decent airflow, the holes in the case plus the filters add a lot of static resistance so you need fans that could work for a radiator. It may end up cheaper getting a different case.
The plus with the case holes is that you can position the fans in many more configurations than they mark, which can make a huge difference because this is a truly tiny case, the order you install things will make a difference in the ability to plug stuff into the motherboard.
3
Yesterday 09:15 PM
18 Posts
Joined May 2020
CrimsonRiver637Yesterday 09:15 PM
18 Posts
I need RAM to come down before I do anything!
1
Yesterday 11:45 PM
225 Posts
Joined Jul 2023
PanicAtTheCostcoYesterday 11:45 PM
225 Posts
they're still trying to peddle this garbage 5 years after GamersNexus slammed it as their worst case ever made?

lol
1
Today 12:29 AM
66 Posts
Joined Dec 2025
MisterTranceToday 12:29 AM
66 Posts
Looks a bit awkward to me.
Today 01:05 AM
39 Posts
Joined Apr 2009
immutablemanToday 01:05 AM
39 Posts
Quote from PanicAtTheCostco :
they're still trying to peddle this garbage 5 years after GamersNexus slammed it as their worst case ever made?

lol
i thought they slammed the ATX version. this is the littler brother mATX where the power supply is below not blocking the front. but IF they did slam this one, i'd like to know because i was thinking about it. you're also totally right that it has the same dumb frame air flow holes though.

Sign up for a Slickdeals account to remove this ad.

Today 02:51 AM
9,366 Posts
Joined Oct 2008
DontTaxBeerToday 02:51 AM
9,366 Posts
Quote from PanicAtTheCostco :
they're still trying to peddle this garbage 5 years after GamersNexus slammed it as their worst case ever made?

lol
no drive bays. basically the drives are put in the back of the board with zero airflow. they wont last long.
Today 02:55 AM
1,579 Posts
Joined May 2011
nathan646Today 02:55 AM
1,579 Posts
Quote from PanicAtTheCostco :
they're still trying to peddle this garbage 5 years after GamersNexus slammed it as their worst case ever made?lol
Isn't this case super old? I swear I remember looking at this while building my Athlon64 3200+.

Leave a Comment

Unregistered (You)

Related Searches

ComputersComputer PartsComputer CasesCooler MasterAmazon

Popular Deals

See All
Found by boyunse
May 12, 2026 10:19 PM
Forum Thread
Jollibee Spend $45, Get $10 Off $35$35$45
22% off
6
Found by minntwins
May 13, 2026 03:10 PM
Forum Thread
32 Degrees Men's Cool Sleep Shorts (Various) $5.99 & More + Free Shipping on $24+$5.99
5
Found by cvp33
Yesterday 10:42 PM
Forum Thread
REFURBISHED Citizen Men's Navihawk Chronograph Date Eco-Drive Gray Watch 48 MM AT8227-56X $232$232$795
70% off
0
Found by DOGGIEVIEW
May 12, 2026 08:24 PM
Forum Thread
12-Pack 40mm Franklin Official Size One Star Table Tennis Balls (White) - $1.81 w/S&S, (As Low As - $1.72) Amazon$1.81
0
Found by phoinix
May 13, 2026 05:32 AM
Forum Thread
[SnS, AC] $4.19* | 40oz Peter Pan Natural Creamy Peanut Butter Spread at Amazon$4.19$5.64
25% off
0

Trending Deals

See All
Found by neomatrixviper
Today 01:29 AM
Forum Thread
The Terror: Season 1 [Blu-ray] $14.99 Amazon.com$15$30
50% off
4
Found by Dr.W
Today 03:13 AM
Forum Thread
(6 Pack) BUCASA 152LED Solar Motion Light Outdoor 850LM Super Bright 3-Mode Motion Sensor Lights $19.99$20$40
50% off
0
Found by Blubluthehusky
Today 01:16 AM
Forum Thread
Bosch 300 Series 24-in Front Control Built-in Dishwasher ( Stainless Steel ) With Third Rack, PrecisionWash and PureDry , 50-Decibel | SHE3ADF5N $519$519$649
20% off
1
Found by phoinix
Today 04:52 AM
Forum Thread
$199 | Kärcher K 3000 E Electric Pressure Washer 3000 PSI High-Performance Cleaning for Heavy-Duty Home Restoration at Amazon$199$450
55% off
3
Found by Immortalsolitude
Yesterday 09:25 PM
Forum Thread
Arlo Essential Indoor Security Camera 2K (2nd Gen, 2023 Release) - Wired Plug-in Power 1 Cam, White $19.99$20$80
75% off
1