Let me preface this by saying I know NOTHING at all about them - however, my DD mentioned that my granddaughter might like one for Christmas..
Is 7 years old too young? How much do they normally cost - and what would be a good sale price?
Anything specific I should be looking for if I decide to get one?
Thanks!
Is 7 years old too young? How much do they normally cost - and what would be a good sale price?
Anything specific I should be looking for if I decide to get one?
Thanks!

but the Magnavox is more likely to reject them. We've used both in the car for long trips and they are lifesavers. DD has held the player on her lap (it sits on a pillow) since she was 5 years old - before that, I sat in the back with her and held it. A bag wouldn't work for us because she sits in the center, and I didn't want it suspended between the two front seats. But if your child(ren) sit outboard, there are a variety of nice holders. I'm pretty sure all portable DVDs come with a power adapter to use in the car.
. The one I got is a Kawasaki brand, and I believe it comes with the car adapter, battery, and the cables to attach to tv. I haven't opened it yet, so I can't vouch for how good it works. I think it was a good price for a smaaaaallll screen, though. Depends on how small you want it.