Mine was selling my Megadrive and 32x.
Traded it in at CEX (the main used game store in the UK) in about 2001. Hardly used it then so didn't really care what I got for it. There was about 50 or so complete Megadrive games with it but I'm not really that bothered about losing those. What I do regret selling was the 32x. I was a massive Sega fanboy then and really wanted to 32x to do well and therefore bought all the games I could. I had Virtua Fighter, Virtua Racing, Knuckles Chaotix, Darxide, Cosmic Carnage, Kolibri, Fred Couples, Doom, Mortal Kombat 2, MotoCross, After Burner, Space Harrier, Stellar Assault.... The're the ones I can remember, probably had more (I remember I got Virtua fighter for Xmas the year it came out. Got up at 4am that xmas day and spent literally 6 hours solid playing it)!!!
Anyway, I traded the whole lot in (games, consoles etc) for about £50. They didnt even want the 32x console as they said they didnt sell them so gave me £3 for it!
Ironically, one console I haven't got now is a 32x as I just cant find one for what I call a reasonable price here in the UK. Unboxed ones with cables go for about £50 upwards on the bay. More with spacers and RF shields.
