Never crossed my mind.Have you thought about eBay, Craigslist or your local pawn shop?I would like to hear about your experience with selling used gear to some of those vendors, or to other similar ones. Price, quote before and/or after shipping, etc.
Please, keep ebay, craigslist, your local pawn shop, etc., away from this thread!
I had good experience with Adorama once as a buyer - I got my Canon 15mm fisheye used from there, as described. I wonder how is it on the other side.