In the US, I've been reading a lot of good things in the Washington, DC, club's forum (www[dot]bmwbmw[dot]com) about www[dot]Beemerboneyard[dot]com, for both price and service. I haven't dealt with them personally (yet), so I'm merely passing along hearsay.
[smiley=embarassed.gif] Â Please disregard the paragraph above for carb rebuild kits. Alas, BBY does not deal in airhead parts, though it does sell limited items such as oil change kits, disks and calipers (?), etc. (On a hunch, I checked a few minutes ago, as soon as I logged off this site.) Sorry for the misinformation.