I bought a 916 brake master cylinder off ebay, complete with resevoir, lever and even braided brake lines on it, for £52.
As the brake lines were no good for me (it's for the DesmoDue bike and they split below the bottom yoke, so are not ACU approved, and I already have twin lines for it) I punted the lines back on ebay.
Ended up getting £34.95 for the brake lines, so in total the brake master cylinder cost me £17.
Bargain
