I have the same 3 Maguiars products in my garage, they were the first thing I tried - but they're now redundant, the AG products with a water spray are, IMHO, much better, as is AG HD wax as the top coat.
AG Bodyshop stuff is supposedly only available to pro bodyshops, but I'm lucky enough to have a fairly local place to buy, plus it's available on eBay. 3M stuff is available from 3M online or on eBay.
DJ, what part of the world are you?