I couldn't see any M logos on the M3 parts in their photos. It says made by TRW?
Also, had a look at the brakes section and the 'OEM 3 series' pads seem way too cheap.
The cheapest place I could find was ECS for $550ish.
BMW 135i N54
MERCEDES CLA45 AMG
PAST: NINJA 300 ABS, BMW E46