Under 200...... I have a Dynex. it is not 12 volt but it is 28 inches, no DVD though, however it has an input for the DVD player (2 of them in fact) and there is one of those right next to it (You can buy those for like 10 bucks)
100 bucks at a pawn shop.
I also have a Samsung I got at a Wal*Mart scratch & dent sale, this is 12 volt (Actually 14 volt)
SOME people here in the forums have expressed concern over powering a 12 volt TV with 13.6 to 15 volts of an RV house system, They believe their 12 volt TV's suffered early demise... I can not support, nor can I argue with them.
But my 14 volt Samsung it would seem addresses that very issue. 14 volt +/- 10% = 12.6 to 15.4 20 percent 11.2 to 16.8 20 percent is normal tolerance.