The product can be mail ordered from Sal Zaino directly
http://www.zainobros.com/
or if you cruise around the site there's a list of secondary distributors. In my county I can pick it up at Eckler's Chevrolet (famous among Corvette fans - they swear by it).
His product line may be confusing, if serious about getting some contact me, or e-mail/call him direct. He doesn't tolerate fools well, but will talk and is quite knowledgable about polymer chemistry application to paint shine and protection.