Besides the Cannery, I'm not aware of anything much closer than the twin cities. There's a Natural Foods co-op in Grand Forks by the name of Amazing Grains
have bulk 2-row, but I'm not positive. Maybe give them a call and see, and drop a comment back here if you have any luck.
I'm trying to piece together a list of what I'm going to brew thru the end of the year so I can stop at Midwest of Northern Brewer the next time I travel thru the cities so I can buy bulk and not have to pay shipping.