I bought mine from this site:
http://www.shop.carriercomp.com. These tubes are titanium and of excellent quality. I'm very happy with mine. Also, Kip is very pleasant to deal with. I would highly recommend you check it out.
Thanks for your prompt action! I wish all vendors were as accomodating:D I'm having a problem choosing a shipping method though, I am getting an error "Please enter a valid ZIP Code for the recipient" in the shipping method screen.