If (like me) you like having bees living inside of your head, you'll be pleased to know that as of 2007, virtually the entire Firesign Theatre back catalog is in print once again.

Laugh.com

Here you can find all manner of comedy CDs, including the Firesign Theatre back catalog. There's a link on the page just for their stuff.

Lodestone Catalog

A great site for fans of audio theatre. In addition to Firesign recordings, there's also some great Firesign T-shirts and related merchandise available here.

Amazon.com

In addition to Firesign recordings, you'll find links to Amazon affiliate merchants selling rare and out-of-print Firesign stuff such as the Big Book Of Plays and Firesign Theatre Joke Book.

Firezine

Fred Weibel published FIREZINE, a Firesign Theatre fan magazine, from the mid '90s to the early 2Ks. He offers back issues of the 'zine through his site. in 2006 his book Backwards Into The Future: The Recorded History of the Firesign Theatre was published by Bear Manor Media and is available directly from Fred through the firezine.net web site as well as other online vendors.