If you want variety in model rocket motors (BP/composite), head over to East Europe: the Poles(EMI/TSP), the Czechs(Delta),the Slovaks(Vymopo); Serbia(Ultra); Slovenia (Mach)Ukraine(MRD) all have a plenthora of rocket motors to choose from.

And don't leave out the Chinese model rocket motors, it's an odd assortment:

http://www.made-in-china.com/china-...C6-4-D5-0-.html