I can buy a Amiga 600 which was nerver been opened (seal underneath is not broken).
Is it worth buying a Amiga 600? What would be a reasonable price for a A600 in good condition?
It all depends how much you want it, what's included and HOW well it's been treated. Check for missing screws, bent or missing pins in the pcmcia, expansion port and rear connectors.
I bought one last year for around 300-350$ with no box, only a shoddy mouse, the low-wattage PSU, missing screws and it was full of dirt. It smelled like cat urin...
But it's living the happy days now, with a 604n, rtc clock module, CF card, and soon maybe a Indivision and a rapidroad? :-P