Amazon offers 10% back in Amazon Rewards with the purchase of select HDTVs. (Rewards will automatically convert into a promotional code 35 days after your order ships.) Plus, all orders bag free shipping. That's among the best Rewards offers we've seen from Amazon, although we saw 15% back on select 4K UHD TVs during Black Friday week. The rewards expire after six months. A couple of best bets, with comparisons assuming you'll use the credit: