Well, for 4x5" and under, the best place is "overseas" - mail order through Freestyle or B&H. I imagine it's the same with larger formats. My big film order this year, I saved 50% over local costs, and that's including postage and so forth. Currently it is especially good, with the AU$ above parity with the US$. Freestyle delivers astonishingly quickly too (like 4 days!!) It's not that I don't want to buy locally, but 50% is quite a lot...

Marc!