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expiredphoinix | Staff posted Nov 15, 2025 04:34 PM
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expiredphoinix | Staff posted Nov 15, 2025 04:34 PM

Cooler Master MasterBox Q300L Micro-ATX Tower PC Case w/ Magnetic Dust Filter

$30

$40

25% off
Amazon
18 Comments 8,600 Views
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Deal Details
Amazon has Cooler Master MasterBox Q300L Micro-ATX Tower Computer Case with Magnetic Design Dust Filter for $34.99 - $5 when you 'clip' the coupon on product page = $29.99. Shipping is free w/ Prime or on $35+ orders.

Thanks to Deal Hunter phoinix for posting this deal.
  • Note: You must be logged in to clip coupons; coupons are typically for one-time use.
About this item:
  • 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 SubZero5 | Staff
  • About this deal:
    • Our research indicates that this deal is $5 less (14% savings) than the next best available price from a reputable merchant with prices starting from $34.99 at the time of this posting.
  • About this product:
    • 2-year warranty
    • Rating of 4.5/5 from 13K+ Amazon customer reviews.
  • About this store:

Original Post

Written by phoinix | Staff
Product Info
Community Notes
About the Poster
Deal Details
Product Info
Community Notes
About the Poster
Amazon has Cooler Master MasterBox Q300L Micro-ATX Tower Computer Case with Magnetic Design Dust Filter for $34.99 - $5 when you 'clip' the coupon on product page = $29.99. Shipping is free w/ Prime or on $35+ orders.

Thanks to Deal Hunter phoinix for posting this deal.
  • Note: You must be logged in to clip coupons; coupons are typically for one-time use.
About this item:
  • 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 SubZero5 | Staff
  • About this deal:
    • Our research indicates that this deal is $5 less (14% savings) than the next best available price from a reputable merchant with prices starting from $34.99 at the time of this posting.
  • About this product:
    • 2-year warranty
    • Rating of 4.5/5 from 13K+ Amazon customer reviews.
  • About this store:

Original Post

Written by phoinix | Staff

Community Voting

Deal Score
+28
Good Deal
Visit 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 

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Sort: Lowest to Highest | Last Updated 12/6/2025, 11:46 AM
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Top Comments

vcbb10
98 Posts
34 Reputation
FYI: Building in this case is a terrible experience. Flimsy panels, acrylic side panel, restrictive airflow, low build quality. Spend $20-$30 more.
az060693
1348 Posts
304 Reputation
The CM Elite 302 is a much better deal for $10 more https://www.newegg.com/p/N82E1681...6811119463

17 Comments

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Nov 15, 2025 04:45 PM
98 Posts
Joined Mar 2009
vcbb10Nov 15, 2025 04:45 PM
98 Posts

Our community has rated this post as helpful. If you agree, why not thank vcbb10

FYI: Building in this case is a terrible experience. Flimsy panels, acrylic side panel, restrictive airflow, low build quality. Spend $20-$30 more.
7
1
3
Nov 15, 2025 05:41 PM
1,348 Posts
Joined Feb 2009
az060693Nov 15, 2025 05:41 PM
1,348 Posts

Our community has rated this post as helpful. If you agree, why not thank az060693

The CM Elite 302 is a much better deal for $10 more https://www.newegg.com/p/N82E1681...6811119463
2
2
Nov 15, 2025 06:08 PM
1,692 Posts
Joined Dec 2010
av911Nov 15, 2025 06:08 PM
1,692 Posts
No problems with it. Feels cheap? It's this price for a reason. Airflow? Remove the magnetic filter.
5
Nov 15, 2025 06:34 PM
1 Posts
Joined Mar 2025
LargeGrapesNov 15, 2025 06:34 PM
1 Posts
I have this case, I was just building something conservative at the time and it's met my needs over the last several years. (I turn my PC on like once every 2 months). I enjoyed that I can relocate the usb slots and the power button, I also have no idea where the magnetic things are!
1
Nov 15, 2025 08:07 PM
2,034 Posts
Joined Jan 2004
DDManNov 15, 2025 08:07 PM
2,034 Posts
I too have this case. It's OKAY but if you put a radiator up front and use rounded head screws then you will feel them through the thin magnetic front and side filters.

Also the buttons being on the side is annoying and forces you to only have the window one way
Pro
Nov 15, 2025 08:21 PM
12,354 Posts
Joined Nov 2010
PeteyTheStriker
Pro
Nov 15, 2025 08:21 PM
12,354 Posts
Have the special edition of this case, which has the different magnetic covers, overall happy with it. Have had it now for almost 5 years. Been looking for a new case lately because thinking of a new build. If you like to build small this case works. The only issue is the larger GFX cards can sometimes be a pain to get in and out if you have your radiator in the front of the case.
1
Nov 15, 2025 08:40 PM
22 Posts
Joined Mar 2024
BoastfulWren888Nov 15, 2025 08:40 PM
22 Posts
Worth it at the price. Definitely, cheap build quality, and the build experience and cable management could be better, but I purchased one at $40 years ago, and it is still together.

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Nov 15, 2025 08:44 PM
35 Posts
Joined Nov 2020
RelaxedTent556Nov 15, 2025 08:44 PM
35 Posts
I have this-- it's fine. Never had an issue with temperatures, I use liquid cooler facing up and intake fans in front, one exhaust fan in back.
Nov 15, 2025 10:16 PM
185 Posts
Joined Mar 2014
justsomeguy500Nov 15, 2025 10:16 PM
185 Posts
I have this and one thing I really dislike about it is the front magnetic filter. If I leave it on, any time I go to pick this thing up, I always forget about it and the pc starts to slip out of my grip with me holding the magnet and almost dropping the thing. You have to be conscious about picking this thing up.
Nov 15, 2025 10:59 PM
2,169 Posts
Joined Nov 2006
pdincNov 15, 2025 10:59 PM
2,169 Posts
If you want the cheapest case to store your old parts in this does the job
Nov 15, 2025 11:02 PM
193 Posts
Joined Oct 2015
allstar0419Nov 15, 2025 11:02 PM
193 Posts
Quote from az060693 :
The CM Elite 302 is a much better deal for $10 more https://www.newegg.com/p/N82E1681...6811119463
Going with the Elite 302 over this will be be the best $10 you ever spend in your life
Nov 16, 2025 12:08 AM
3,141 Posts
Joined Mar 2011
jasongwNov 16, 2025 12:08 AM
3,141 Posts
Quote from vcbb10 :
FYI: Building in this case is a terrible experience. Flimsy panels, acrylic side panel, restrictive airflow, low build quality. Spend $20-$30 more.
The second version is better, but I can't say I had a hard time building in this PC chassis. I used one to build a SteamOS "console", and it's been terrific for that purpose. At $30 I can definitely recommend it as a solid budget option for this purpose at the very least.
Nov 16, 2025 04:37 AM
1,348 Posts
Joined Feb 2009
az060693Nov 16, 2025 04:37 AM
1,348 Posts
Quote from allstar0419 :
Going with the Elite 302 over this will be be the best $10 you ever spend in your life
More than double the quality for $10, its nuts how much of an improvement it is.
Nov 16, 2025 06:24 AM
56 Posts
Joined Apr 2025
MaziRoddy999Nov 16, 2025 06:24 AM
56 Posts
The plexi-glass side panel is a dead giveaway why this case is so cheap.

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Nov 16, 2025 08:51 AM
344 Posts
Joined Jul 2003
MasterchiNov 16, 2025 08:51 AM
344 Posts
I've used this case in 3 or more computers that have now in operation for like 3 years+ . It's my go to budget case. Have not really had an issues with the case besides the easy to shift magnetic "Dust" plates, otherwise it's a really cost effective budget friendly case that has just the right amount of options n my opinion.
1

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