The Flips you probably can't get below 90 or so, but there seems to be a lot of knockoffs these days for less. there's probably no reason to try to get HD and stuff. Browse flip camera on amazon, and follow the "also looked at" etc. that should give you an idea.
Toys r us has a kodak mini in their ad this week for $50. I don't know anything about them but I thought I would give you a heads up. We have a Kodak playsport and love it but those are generally $100 and up.