I know it's not eBay sorry!
I'm listing all my old CDs on Amazon and I've got this Single to put on. It's not sold by Amazon but there are 2 listed as New by the same company. The price is £189.99 
I don't want that for it (well i do! But i dont expect it iyswim) but I don't know what to charge now for fear of enraging the other guy selling it
WWYD or have you done in the past in this situation?