I must be very fortunate, I just had a S-10 frame sandblasted, $95.00, two running boards, dashboard, front splash shield, 2 fenders $45.00.
I also have one of the 20 gal sandblasters and I use shifted play sand in it. $2.35 for 50 lb bag. It works great for the smaller things like rims. I've used it to blast complete trucks before. Including on 6X6 5 1/2 ton truck. I have found that the play sand from Home Depot works best.