I went to my local GC today to see if I could trade my Tama Ergoryder Throne for a Rock n Sock Nitro. Instead of making an offer to trade; they said they buy used gear all the time. I also have a DR-503 Icon Curved Rack and I wonder if they would give me enough for the Throne and a great Cowbell? Both the Rack and the Throne are in mint condition. Anybody have experience with GC's used gear practices?