hey man, i know of a place in Scarborough (Midland and Lawrence) called Midland Calipers, they charged me $75 per caliper to rebuild 300zx 4 piston calipers and they even painted them black for me, not the shiniest paint but it still looks good! i dont suppose your calipers would cost more than that, check out their website… http://www.midwestcalipers.com
hope it helps!