Sorry - been offline for a while...
Here's a link to seller's current offering (of same product):
Pair Headrest 7" LCD Car Monitor 2 DVD Player FM USB SD - eBay (item 180367244068 end time Jul-09-09 22:59:31 PDT)
System worked great during a trip last week (9+ hrs of driving each way). Kids stayed quiet. This replaced a older system that strapped onto the back of the seats.
All I need to do now is figure out a way to hard wire an inverter to allow the kids to use the old Xbox (not 360). I don't really like having an inverter that plugs into cig lighter...