300€ is a realistic starting offer IMO. Also depends on the state of the device, obviously, or if it has some extra "collector's features".

I've seen sellers here an on ebay, Amazon etc. demanding fantasy prices and creating artificial sales by putting up overpriced ads, closing them as sold, and then re-opening another one for the same price (or slightly cheaper).

Of course I have no idea for how much money they really go; let's just say I have a strong hunch that most of them go for significantly less in the end.

I'm just an onlooker here. I'd never spend that much money on a "collector's item" - but of course I'd be interested in getting a good price for it if I had one to sell, from way back when.