I just bought a set of six from a guy who had to upgrade his tires to 22.5's. His truck originally had the widow-maker wheels and they wouldn't pass inspection. I gave him $200.00 for them and 4 of the 6 were almost brand new. I found another set for my other truck at a salvage yard. The truck had brand new tires installed just before the driver blew up the engine (Ford truck). Got that set for $450.00. Both sets are the 8.25X20's. If you search you will find some. The 6.50's and the 7.50's are getting to be quite rare and hard to find. 8.25's are much more common,
Scott