Amazon offers 15% back in Amazon Rewards with the purchase of select LG 4K Ultra HDTVs and 3D HDTVs. (Rewards will automatically convert into a promotional code 35 days after your order ships.) That's one of the best rewards promotions we've seen from Amazon, and yields a number of all-time lows on premium LG TVs. Rewards expire after six months. A couple of best bets: