I am not a superhardcore collector but I do have some things i would have to think twice if I ever did decide to sell
Contra Hard Corps Genesis
Phantasy Star SMS
Discworld PS1
Zelda Oracle of Seasons Gameboy
Interact Barracuda PS1 controller, I was told by someone on the Atari Age chat that this controller is so rare there is almost nothing on it anywhere. Including a copy of the manual which I have been looking for since I bought the thing on closeout...which turned out good and bad. Good, because it's an excellent controller. Bad, because I got it after Interact was gone and no way to get a copy of the manual. I make a deal out of that because it's programmable and it has 3 settings 2 of which I have no idea what they do. Beside I haven't a clue how to program it.