Thought I'd throw a feeler out there and see if there's any interest in a nice set of rear calipers from a 2006 Audi S4?
These brakes make a nice cheap upgrade for B6 or B7 A4s and can even be fitted to B5s as well.

Calipers are in excellent condition, guide pins still slide freely and piston seems to move fine. Includes calipers and carriers.

Asking $250 Canadian + shipping,
If they don't sell in the next week or two I'll just return them for a core refund I have pending.