Fog Machine Update
Also, scroll down to the comments of that post for tips on use and cleaning. People have also listed other places to get it, both in the US and abroad.
UPDATE OF THE UPDATE: $19.95, here, mail order, includes the juice. (Thanks, Sam!)
New to Strobist? Start here | Or jump right to Lighting 101
Connect w/Strobist readers via: Words | Photos
Got a question? Hit me on Twitter: @Strobist
Save Money: Browse MPEX Weekly Strobist Deals