VIPoutlet has Samsung 58" Class 4K (2160P) Smart LED TV (UN58MU6070FXZA) for $350 after "PMEMDAY" coupon. Shipping is free. The tv is refurbished but comes with 90 day warranty.
I have 8% ebay bucks that sweetens the deal. After ebay bucks, $322 is the total. YMMV
I have personally purchased refurbished TVs from Vipoutlet before and it was a fantastic transaction. Tv always arrives as new with plastics, stand and remote controller. No problems whatsoever. FYI, I have noticed in the past Vipoutlet tend to fluctuate their prices so I will recommend if you are interested "buy now, think later".