A case with 2x A500, an a1200, a 1084S, several PSUs/mice/joysticks, an action replay for A500 and about 700 "blank" disks. Got it for about 45 euro from a collegue in 2001.
Worst deal: I sold my A600 with 40MB HDD and 1mb RAM Expansion for 500 guilders (+/- 250USD) cash in 1998. Sounds like a good deal, right? Well it wasn't: the money turned out to be counterfit. Filed a report with the police, but after questioning and handing over the counterfitted money I never heard from them again.