I've been killing it the last couple of weeks, thanks to Craigslist, Facebook, and garage sales.

Nintendo & 30 Games for $50 (notable games are Donkey Kong & Gargoyle's Quest 2)
Gameboy in original box and paperwork for $10
Super Nintendo CIB with 9 games (all sports games but most have boxes and some have instructions) for $40
Virtualboy with Mario Clash & Mario Tennis for $35