North Country Malt Supply...I learned the hard way that in order to ship freight, I'd have to buy 7+ sacks of malt and have it delivered to a commercial address. As it were, I paid roughly $58 per sack, but I got a wider variety of grain in that quantity than was available at the LHBS.
I got one of each: Golden Promise, Marris Otter, Vienna, Munich, Pilsner, and Pale malts. If you're just looking for a base malt and can get into town easily, try South Hills Brewing Supply or Country Wines (same owners, sister stores). They sell a full sack to you if they have (not divided out yet).