There is a Mexican market/dump in Banning off 22nd St. that is a great post-Tahquitz burrito place. Found places in Fresno and Bakersfield area that also rock, way better than anything I've found in Bishop.
+1 for the burritos at MonoMart (or whatever it's called) in Lee Vining. Not a good as the above-mentioned, but by far the best thing in the vicinity.