I've chucked up some pretty rare stuff in good condition on eBay, such as an unsealed Persona 4 for PS2, and a Pokemon Ruby GBA in box. All in great condition.
If you know any retro collectors, please point them in this direction:
https://www.m.ebay.co.uk/sch/i.html?sid=shaolin_monkey&isRefine=true&_pgn=1