I just purchased a Tivax HiRez7 (7" screen) from a local consumer electronics shop. The shop owner understood my need to test the product before buying, which I couldn't do at the local Wal-Mart, was willing to special order the product knowing I might not buy. "If it is as good as I think it is, I won't have any problem selling it".
It is a portable TV capable of receiving digital TV broadcasts, has an AV input for composite video and stereo audio, as well as a switchable USB/SD card input. Powered via AC adapter or rechargeable li-ion batteries.
Set to AV input, the composite image was exceptionally good. It will be a good addition to my camera ladder, solving a bunch of issues. Cost: about $160.00.
http://www.tivax.com should you need a reference.