Do you have a local malster? I have a good one, Valley Malt in Hadley, MA. They have a sort of malt CSA that I have used a couple times where you choose the 50# sack of base malt (pilsner or pale) and you also get a bunch of specialty malts and a couple smaller (5-10#?) sacks of base malt such as munich, vienna, and rye. I am pretty sure you can just get a big sack of base malt too.