I buy my brass directly from Starline Brass Company
. I last bought BP in bulk from Powder Incorporated
. Primers I bought in bulk from Cabelas along with some smokeless powder but only because I had a $75 off coupon I got in the mail. For bullets I need to work on that. Typically, I just order 500 bullets at a time but they come with smokeless lube which may or may not be usable for your application. I need to get a cheaper source for bullets but I'm not quite ready to take on casting just yet....even though I know I should.
p.s. Correctomundo...I last bought in bulk from Jack's Powder Keg
. It was $12.60/lb but now its up to $13.40/lb. I'd probably buy Diamondback Powder
at $10.15/lb the next time around.