I am selling a GVP G-Force 030/40 and a ICD 4MB RAM board on eBay. I am not sure how to link to my stuff so I would suggest going to eBay and simply listing all my auctions (eBay name is "donstratton" and I am selling very little so the Amiga stuff is easy to find).
The G-Force starts at $50, the ICD starts at $35.
I had listed a Micron 2MB RAM board twice but got no bids (plenty of watchers... sigh), and I am not sure I want to list there again, so if someone wants to make me an offer you can sent me a private message here.
