Sourdough bread?

[tda]

Where can I find it near Champlin?

[steve_in_stpaul]

I'm not familiar with the food coops in your area, but many of the coops closer to the cities of Minneapolis/St. Paul carry Saint Agnes bakery's sourdough loaves. There is Grass Roots Coop in Anoka. Might be worth calling them.

[splatgirl]

It depends on your standards and what you mean by sourdough and bread. Lunds/Byerlys bakery would have something labeled as such, but it's a very poor example. Probably whatever you could find at Super Target likewise.
The closest possibility I can think of would be Chez Arnaud in Maple Grove or Plymouth. Most of their breads are not naturally leavened, but IIRC they do a few varieties. Their baking schedule and availability varies by day.

The only real (and good) artisan sourdoughs I have had here are Patisserie 46 and Rustica. Both in Mpls.

[tda]

That's funny. My google search gave me Patieerie 46 where I went on Friday. The lunch items looked pretty good as well.