Only the open market will tell... I've seen some go for 80% of their retail price and others go for 20%....... It all depends on the number of people that want THAT bow........ I would guess that you would get atleat 50% for it though...... The problem you run into is that most guys are hunting or are about to be hunting and as such they may not be in the market for a new bow....
Goodluck.
Post some pictures of it, you may get some offers