Sadly there aren't many places to hunt where I live, but on the one flea market that's nearby, I scored Castlevania Chronicles (complete), Skies of Arcadia Legends (complete), and Earthbound (cartridge only) for $5 each. On that very same flea market on a different day I found Ninja Gaiden Trilogy, but didn't bother picking it up because I was an effing idiot. I still beat myself for that to this day.