car dvd player for sale

hello everyone! My buddy has a new car with the banks system he is looking for a portable car DVD for his truck. He knows nothing about them but only want buy it online conveniently from ebay.com or sourcinggate.com/car-dvd-players-c-186.html. so he asked me for my opinion and I don’t know much about portable car DVD so I’m asking you guys what would be the best choice for a portable car DVD for his truck he is looking to spend no more than $100 for one so let me know guys thanks!