If you are into 4K TV, the Seiki SE39UY04 39 incher is what we come across as the cheapest 4K TV available. It has a pretty good specification at a very affordable price. Below are the specifications and the link to the site.
3840 x 2160 Panel Resolution, 4K up scaling, Thin Bezel
Aspect Ratio: 16:9, Refresh Rate: 120Hz, Component & HDMI Support: 480I, 576I, 480P, 576P, 720P, 1080I, 1080P, 4k2k 30Hz (only HDMI)
Video Connections: 1 Analog & Digital TV Tuner, 1 Component Video Input, Component Video (Y, Cb, Cr/Y, Pb, Pr): One VGA Input (15 pin, D-Sub)
Audio Connections: 1 Stereo Mini Phono Jack Input (3.5 mm) (VGA Audio), 1 RCA Input (R & L), 1 Headphone: Stereo Mini (3.5 mm), 1 RCA Output (R & L)
3 HDMI Input, 2 USB Input (JPEG Pics and MP3 Audio Only)