Walmart offers the Samsung 57.5" 4K LED-Backlit LCD Ultra HD Smart Television, model no. UN58MU6070FXZA, for $528 with free shipping. That's tied with last week's mention as the lowest price we've seen. (Outside of the seller below, it's the best deal now by $20.) It features a 3840x2160 (4K, 2160p) native resolution, 4K upscaling, 802.11ac wireless, Smart Hub (with access to Netflix, YouTube, Hulu Plus, more), Bluetooth, USB, and two HDMI inputs.

A close price: Best Buy offers it for an in-cart price of $529.99 with free shipping.