I live in the MI thumb, and I can't find DE either. I'm using Stall Dri and I love it. It's working very well to control odor in my brooders. Since Stall Dri has DE in it, I figure it's the next best thing. I'm really going to put it to the test next week...I'm getting a few meat chicks.
It really depends on what you want to accomplish. If you want to dust your birds and put it in their food, you need to use food grade DE. If it's around the coop and such, then the Stall Dri works well.
If you cannot find it locally, a company called Countryside Naturals sells it and will ship it to you. It's a bit pricey, so I guess it will depend on how much you want to spend---
I hate paying shipping.