http://www.modelexpo-online.com/aspfiles/subcat.asp?Keysearch=tamiya,paint&Category=paint&UID=2002021912595550&GEN9=
I think model expo is the chepest out there if you only want to buy tamiya acrylic. As for the windex thing, i usually clean my iwata hp-c with full stength windex even though on the insert included with the brush said something like 20% ammonia 80 water. the cup is slightly tarnished, but i think its because the inside of the cup is poorly or not plated at all. Its not shiny like the outside of the brush.