I worked my way through HVAC school at one of those old fashion gas stations,,,you know, the ones that are not around anymore, ok, I have patched many tubes, tires and so on....Lets see now, simple little tires , we used the rubber string and glue, push it through the tire , pull it back out , whala,,its done..
But, large mud tires and nails and junk rolling around in the tire after they run over something, not so easy,,,try it in the winter,,,tires don't spin off the rim easily, nor do they go on easy,,,if you have ever done this for extra income,,you understand,, not all goes well...we did all this at 5 bucks for cars and 10 for pickups and more for those large mud tires...18 wheeler tires ,,, you cant even imagine...
With today's fancy wheels and its easy to damage ,,,try a Corvette flat repair or tire change,,,yep 30 bucks is cheap,,,imho.