There's a lot of action on FB also:

https://www.facebook.com/groups/AudiRS6BuySell/

https://www.facebook.com/groups/audirs6/

Bought mine in Torrence, CA. And work on one from the LA area, plus a 600hp S5. If you run out of options, bring it up here (Oregon) as the Audi following is undeniable. We have mountains and snow/rain, which makes Quattro a must have.

GLWS