One of the best sellers among HDTVs at Walmart and the cheapest 40-incher on the market at the time of this writing is the Sceptre X405BV-FHD3 with a price of $298, 1080p screen resolution, and 60Hz refresh rate.
Equipped with just no-frills features, the 40-class X405BV-FHD3 is obviously a budget TV. Besides the full HD panel with CCFL baclight, 450cd/m2 brightness, 8ms response time, and 4,500:1 typical contrast ratio, the TV sports an ATSC/NTSC/QAM tuner, three HDMI inputs, Composite and Component in, VGA, and a USB port with support for audio file and digital picture playback. The TV is nicely designed, but is noticeably thicker than the comparable TVs with LED backlight. The Sceptre incorporates 2 x 10-Watt stereo speakers, and SRS TruSurround HD audio enhancement technology.
This model is wall-mountable and has a stand that swivels +/- 30 degrees. Without the stand, it measures 38.98 x 24.1 x 4.25 inches.
You can check it out at the product page at Walmart, offering it for the lowest price on the market right now. In addition, you can take a look at the other cheap HDTV deals.