Most of the better products are not available in stores here. You can find S100 products in Harly Davison stores though. And, some of the auto paint shots around town carry Meguair "mirror shine" professional line. You can sometimes find the pro versions of 3M in Napa autoparts. And, some good stuff (like 303) can also be found at boating stores down at the marina.
You'll need to go to mail order to get
Sonus, Four Star, Poorboys, etc.