In car DVD players

Hi Mums,
We are looking to buy 2 headrest DVD players for our car. We go on lots of trips and find it awesome for the kids.
We have bought the ones off eBay, the ones from big w and target... they only play some dvds and break in a few months.
We like the ones where the kids have a DVD player each and can watch their own things, and watch a DVD together.
Where have you bought your good quality in car DVD players, or do you know where we can buy some online that will last?
Thanks :)