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.
Current: Mercedes CLA45 AMG, Porsche Macan S
Past: BMW 135i, BMW E46, Ninja 300 ABS