Check out Freestyle, they have great prices on fresh film. Arista EDU ultra is (IIRC) the least priced, comes in asa 100 and 400. I have a couple of bricks of 100asa in my freezer, but it won't stay there very long. Try some, I think you will like the stuff and want to shoot more. There is also Fuji Neopan Acros 100, still on the low end of price, but arguably the best of the B&W films to shoot(IMHO). Ever since the price jumps there are no cheapie films to shoot, except maybe the Chinese stuff off of eblah.