To update you on the yo yo day...it turned out that it was a bad stem in the tire--thus the reason the fix-a-flat wouldn't work. We got it repaired and the tire balanced for $10. We will have to price around for new tires.
Now here's a curious a coincidence. We got this flat tire on Saturday. A postmaster friend got a flat tire on Sunday. She was able to find a Wal-mart with an automotive department. Hers was the stem too! She got it repaired for $3.15.
AND another co-worker had a flat tire this morning at his home (his was a nail, though). Sounds like a flat tire epidemic among postal workers!