I'm also an editor of sempervivum swappers and sellers list with adds from Europe, USA, Canada, Australia ... Listing is free as well as an emailed copy. Just ask for it!
In vol. 2 of the semp list there are more than 3 adds, with 1500+ cultivars and species listed. Vol. 3 is due to January 2007 - but I can send you vol. 2 right away.
Please contact me to my email address. Thank you!