Well MMX3 came in a lot with 27 games, system, 2 controllers and the wires for $150 locally. I had to go an interesting way around that one to get it, being honest and warning the dude about the predatory assholes in my town. Between my first call and warning him, to getting the wife to take care of the baby and call 2, his email, mobile phone box both filled, and pricks all asking just for MMX3 and many offering just $10 as a GOOD deal on it. He was furious, and was thankful I called back and was so honest, and most of all, happy I didn't treat him like a transaction or a piece of meat and actually had a conversation. Despite knowing the game was worth around $80, he still kept the price, and even brought it to me the following day late morning instead of me going to get it the following evening.I kept MMX3 from that, also King of Dragons and DKC3 (and World Heroes a cheapie.) The rest I'm trying to turn over to get my cash back as $150 isn't easy for me on my current budget.
MMX2 was a pick up from a nice guy on NintendoAge. I got it and Hogan's Alley for $22 shipped, but the MMX2 cart ended up being loaded with coke and other crap inside that took like an hour almost to clean out, and he felt guilty and pretty much demanded out of guilt to offer me $10 back. I kept saying it wasn't necessary but he did it...so I got MMX2+HA for $12 shipped.
I tend to have a golden rule with used games, I won't pay over the original retail price ($50.) Wild Guns and EVO I got around Dec/Jan for $50 each, they're my most expensive grabs, NGT being second at $40.