The cheapest I've seen is CyberHome. $39.95+tax at Walmart if you're in the U.S. Don't know if not in U.S. It's pretty impressive for player offered so cheap. I bought one for my wife (electronically challenged). This way I'm not out much when she breaks it. I have a Sony, a JVC and a Magnavox (all 5 disc DVD players). No one is allowed to touch them in any way(not even the remote). You may want to check out Apex. They make one that's pretty inexpensive as well. By the way, each these players play all formats but check to make sure as the models vary and so may the playability of some dvd's.
LOL at thoses prices it wasnt that long ago there were 500 bucks plus and look now , wish fuel prices would do that