Picked up a Game Gear (Sega, not Majesco) and the rechargeable battery pack for $18 at Game Exchange. It's not an incredible deal by any means, but I thought it was a good price, and at least I don't have to pay any shipping. As a bonus, there were 6 AA batteries already in it.
I've never owned a GG, so it's a nice addition to my collection. Got a few games for $1 apiece too.
Anybody have some suggestions for some really good GG games I should look out for? I'm definitely going to buy a Master System adapter because I've always loved the MS, and I know there are a lot of great games for it that I want to play on the GG.