Yardsales and thrift stores can be great ways to find old game (and sometimes newer ones!). You just gotta be patient and check frequently. Goodwill doesn't normally have any games worth buying but you never know. Last year my wife picked up Luigi's Mansion, Animal Crossing, and Super Mario Sunshine for $3 apiece in one visit. Pretty awesome! Yardsales are even more hit or miss but it's worth it when you find a great haul like those PS3 games we got. Plus you might find other things you need lol