I buy figures from a seller on ebay. She sells singles cheap, but with no accessories. she also sells small sets of accessories cheap. I've completed a lot of figures and got a lot of custom fodder dealing with her. I'm not endorsing her, but I've bought over $600.00 worth of stuff from her and she never has stiffed me! Heres a link to her auctions.
http://search.ebay.com/_W0QQsassZti...bles2005QQhtZ-1
Right now she has about 20 blueshirts without accessories. From time to time she gets vipers. I got a Python Viper (old Sculpt) from her for about $2.00. Keep an eye on her auctions and you could get lucky!
hope this helps!