The higher end TCL TV's rarely go on sale, especially when they're brand new like this model is. You won't see any discounts for a while, especially not a $100 discount. Model sells for $650 normally but with the 20% off code PICKDADSGIFT, you'll get the discount bringing the total down to $550 shipped w/ no tax (at least in CA).
I picked this TV up at Best Buy earlier in the month and can't recommend it more. 55", FALD, 4K HDR10/DV with really low response time and input lag. There isn't a better TV for the money!
Seller is Electronic_Express and has a 99.5% positive feedback rating.