The HELL you are! These are precious gifts to me and they are non-transferable! How dare you regift my challenge prize. You might as well hock a wedding ring for beer money. -DeeJ
Do not use the public forums to run contests, solicit donations, barter or sell items/services, or advertise anything at all (except on-topic posts in the Classifieds forum).
I believe there is a thread for this on Halo Waypoint.