Best (read: Cheapest) retailer for Birchwood Casey products?

[IronFist]

I plan on weathering some Roman parts to make an Obi-Wan ANH saber. Can anyone tell me the best resource for getting some Aluminum Black, Plub Brown and Brass Black?

I was going to order straight from Birchwood Casey, but thought I'd come here first and see if I can't save a few bucks.

Thanks.