Since there are so many people who buy classic systems on craigslist and this is the most active thread of them, i am looking to buy some retro controllers. I want 2 6-button genesis controllers (or maybe settle with the 3 button ones), 2 snes controllers, 2 nes controllers and 2 Neo Geo home console arcade sticks. Reason being, im going to use them for emulators via bluetooth adapter. What do these things go for? Ive seen a few ads on CL for people selling controllers, want to know what to offer and what to look out for. Thanks.