It's
not an easy job, but you can do it yourself IF the tire is an 8" tire. You'll need steel tire "spoons", but they're not expensive. Harbor Freight should stock the few pieces of equipment you'll need.
If they are bigger than 8", try a used tire location. Before he moved north of town--and upscaled--we had a place that handled used tires right in downtown Wolfeboro!
When you're totally out of luck, you can buy new tires already mounted on new
rims--economically, too--probably where you should have started...
