This is based on reading through the replies of the hundreds of LG OLED65B7A threads. Of course this is YMMV and subjected to change.
Price Protection: Chase: TVsuperstores.com approved, ExpressTVs.com approved, BuyUSA.com denied (because it was a wholesaler site requiring you buy in bulk). Discover: BuyUSA.com approved, TVsuperstores.com denied (because a free wall mount with the TV) one guy say he was approved after he send in a screenshot without the free wall mount showing so YMMV. Citi: TVsuperstores.com approved, BuyUSA.com approved, ExpressTVs.com denied (because their contact page is blank). One reply said they were approved so YMMV. Wells Fargo Visa Signature: BuyUSA.com approved
No one has posted a PP to this retailer yet: tvsdailydeals.com $1,749.00 on 11-26.
Anyone who's had a different result feel free to post that information here.
Citi - ExpressTvs got approved. It took almost 3 weeks though.