A case of beer seems to be the going rate for backyard mechanics. Going way back, about 20 years ago, I had an 1986 Toyota MR2 that had a rear caliper locking up. Went to the dealer, they quoted me $1200 using all Toyota parts, $900 using aftermarket. (Two calipers, rotors and pads) Buddy of mine told me to order the parts myself and he'd show me how to do the swap. In the end, with the beer added in, it cost me around $350.