I got a Vita (OLED model) for $66, but it came to $78 after a warranty and taxes. Not really sure WHY I did this, honestly. I guess I decided it would be smarter to just get a fresh system, rather than trying to repair and potentially ruining the old one. (The right thumb doesn't work and the connector on the bottom no longer transfers data.)
By the way, if you're into collecting video games, a PSP is a good, cost-effective way to do it. Picked up four games and a movie for $25 at Bookman's. There was a huge pile of loose games; it'd probably be safe to say hundreds. Definitely a buyer's market for this system right now.