Great job on the repair to save your shed.
Ryan, You need to contact a few of the independent, (non corporate store) guys that do the road service for truckers and see if they want to buy your tire and wheel stock. I have a friend out here in that business and they have a real hard time find good used tires the truckers who don't want a new tire on a trailer. I think she is paying $90.00 per tire except on the 10.00x 20's, they are a little less. The Bud wheels aren't cheap either, but I don't remember what they bring.
You can check on the web for road service guys in your area to call.