Gravis Grip Multiport and Controllers - any idea of a fair price?

[+Razzie.P]

I have an Gravis Grip Multiport (nice condition) with 2 used gamepads (also nice condition) and 4 gamepads never opened from the plastic bags that they came in when I bought them new. Thinking of trading these or selling them here, ebay, or locally, but I have no idea what approx price I should have in mind. I don't wanna rip anyone off, of course, but I'd like to at least have an idea of what to expect, other than just throw 'em on ebay and let the bidders figure it out. Anyone here have any suggestions?

 

Thanks in advance!