I carry a small tire pump (12v or mechanical) and some tireject and a patch kit, I have never had a flat on the trail since the quads first came out after the 3 wheelers but have helped a few other riders in our group reinflate their tires. We ride in remote areas where bumping into someone is unlikely.
Have you tried any local dealers for takeoff tires and wheels. i was lucky enough to get good deal on a wheel and tire combo takeoff for our Lonestar at a local dealer here in AZ. You can also try Craigslist.