I paid $80 to get an entire S&S 700A cooler sandblasted (top, liner, legs, base...10 pieces total).
He also blasted a 55 slider rack, a flapper, Glasco slider shelf, a few bottle openers, and 3 cap catchers (1 Ideal, 2 Glasco) for free.
I'm pretty pleased with that price for all those pieces. Probably won't get that good of a deal next time...
What sandblasting company are you using?