Hm.. Not sure if I've ever gotten anything overly amazing, but I have gotten:

1. 30+ TG-16 games for around $30 back in the late 90's.
2. Recently acquired a sealed De La Jet Set Radio. It wasnt incredibly cheap, but, I found one.
3. Sega Game Gear back in the late 90's in a Toys'R'Us bargain bin for around.. $15? Games for around $2.