If you're driving up from San Francisco, you can stop at the Home Depot literally right off Interstate 80, which is the route you would be taking most likely. Their location is HUGE, and I'm sure they could order whatever you needed before hand, possibly even the tape if you special order it? My troops and I decided yesterday that we're building a two yurt+monkeyhut mega camp this year. I've been reading nonstop and I'm super excited, good luck and hope to see you on the playa.
EDIT: I'm going to be pricing the building materials for a 12' Hexayurt, in a few days. California taxes and shit, if you want I can post the quote on here so you can get an ideal of what you're spending American dollars?