BrandsMartUSA via eBay offers the Sony 65" 4K 2160p 120Hz WiFi LED-Backlit LCD Ultra HD Smart Telvision, model no. XBR-65X930C, for $2,498 with free shipping. (Amazon and B&H Photo Video both charge the same.) That's the lowest total price we could find by $150, outside of the mention below. It features a 3840x2160 (2160p) native resolution, 120Hz refresh rate, 4K upscaling, 802.11n wireless, Ethernet, Android TV apps (such as Netflix, Hulu, and Pandora), USB, and four HDMI inputs.

A close price, Best Buy has it for $2,499.98 with free shipping.