I picked up the TVIEW's shown in the link on eBay about 3 years ago (if not exactly the same, very similar). I'm sure they have gray too. I wasn't expecting much given the price, but 3 years later, they're still working fine with no issues. This isn't the seller I bought them from......don't recall who it was. The color "brightness" on them isn't spectacular, and side by side the colors are a bit off on one, but my kids could care less, it keeps them entertained.
It's a pretty simple DIY install, just replace your headrests with these, run the wires down the inside backs of the seats, and hook them together under a seat. The sound comes thru an FM station. Mine were meant to be hard wired, but I just picked up a cig lighter plug and wired it to that and plugged them in. Make sure you get ones that have adjustable headrest posts so that you can move the poles to fit the headrest post width. Good luck!
TVIEW TAN 9" DVD HEADREST CAR MONITORS + (2) HEADPHONES | eBay