Flemmings is a shop and they have good prices on the Walnut blasting. Their schedule is pretty much wide open.
Clem (Adam) is a local guy with mad mechanic skills, but he's not a shop and does the walnut blasting when his tech buddies are available.
2011 Mineral White M3 ZCP
Paint Correct, Opticoat, Ventureshield, some CF, B&B exhaust, AFE Intake