Update: all deals are gone as of 12/3/19 except Walmart one.
Not a real deal but some hardworking sharing.Can't paste table. So please check the attached picture for latest pricing. Price was available as if 7PM ET, 12/1/2019
Prices below reported in the following format:
MSRP: Name | Model (ultra bright/local dimming zones) (best current option)
$750: VIZIO M-Series Quantum 65" Class 4K HDR Smart TV | M658-G1 (600/90) ($600 @ costco, expired)
$700: VIZIO M-Series Quantum 65" Class 4K HDR Smart TV | M657-G0 (400/20) ($640 @ Sams)
$700: VIZIO M-Series Quantum 65" Class 4K HDR Smart TV | M656-G4 (400/12) ($498@walmart but OOS)
$550: VIZIO M-Series Quantum 55" Class 4K HDR Smart TV | M558-G1 (600/90) ($480@Bestbuy)
$500: VIZIO M-Series Quantum 55" Class 4K HDR Smart TV | M557-G0 (400/16) ($425@Target+ pickup only)
$500: VIZIO M-Series Quantum 55" Class 4K HDR Smart TV | M556-G4 (400/10) ($400@walmart)
For 65", my favorite is Costco (extended 2 yr warranty with coscto credit card) or Bestbuy (if Amex offer, $30 back $300+ spending)
2. Bestbuy: https://www.bestbuy.com/site/vizi...Id=6345460
For 55", Walmart price is the best for sure. Tareget is slightedly better (in term of local dimming zone), but has pick-up hassle)
1. Walmart: https://www.walmart.com/ip/VIZIO-.../491927729
2. Target pickup: https://www.target.com/p/vizio-m-...A-76198494
BTW, it is a shame that Dell doesn't have any good offer now considering SD tired rebate + 10% Amex offer + possible Dell promo GC. It once had the best deal that I regretted to miss (65" M658-G1 $599+ $200 promo GC): https://slickdeals.net/f/13603471-vizio-m658-g1-65-599-plus-200-dell-card-599
Ref: two 3rd-party review articles in case you want to dig deeper.
Some personal two cents in case you want to hear some independent option.
About selecting variants, there is no double M**8 is better than M**7. But don't expect significant difference. I did some search and can't find a hardware level comparison other than what you have already know in term of ultra bright & local dimming zones. Attached a table from rtings in case you don't even know that. However, how on earth these numbers matter, nobody knows. Seriously. For example, rtings quotes, "We tested the 65" M Series Quantum 2019, version M658-G1, and we expect our results to be valid for the 55" (M558-G1) model as well. The 43" (M437-G1), 50" (M507-G1), 55" (M557-G0), and 65" (M657-G0) are a bit different, as they aren't as bright, and have a more limited local dimming feature. They may perform differently in other ways, but we don't know." Personally, I don't think the difference would be as significant as you imagine (say 90 vs 16) because Vizio rationally wouldn't want its new product to ruin other still ongoing products. My bet is that the benefit would be marginal to noticeable.
Now, about determining right size, for me, it depends on the distance between you and TV. For me it means: (1) room size and (2) if have children. It is not always the bigger the better. My living room is small and have kids who tends to move closer and closer to TV. A bigger screen with the same 4K resolution means bigger pixels and more noticeable glare/discomfort when you sit closer. So bigger screen actually is not a good idea for me (imagine sitting at the very front row of the big screen of the cinema) I eventually picked 55" one. You need to pick your personal desired distance and then decide which size is the best. Bigger is not always better.