Picked up an N64 cleaning kit at a thrift store: $4.94, complete. In the box was also a N64 expansion pak (goes for about $20 on ebay).
At a antique store, I found a cool tin/aluminum(?) spinning top for $2.00. You pull the handle up, and then push down really fast to make it spin. Looks nice. Has little cartoon graphics on the top and bottom.
Lastly, at a record/music store, I picked up Sol Feace for the Sega CD. Looks like a schmup, but not sure--haven't tested. I think it was a pack-in game because it comes in a small cardboard sleeve as opposed to a bigger longbox case. This was a smidge under $4.00
