I've got hundreds of .45ACP small primer good cleaned brass I'd love to trade for .40SW. 1 to 1. If someone happens to have a surplus of .40 (like I do .45) we can be pals.
For those interested in trading components, check out the Gun Show section, in particular the "Buy, Sell and Trade: Holsters, Gear and Accessories." I have had excellent success trading surplus items for things I need.