What stores sell your beers and in what states.

You should check their website. There's a locator.

I know Costco and Hyvee has it. I am pretty sure I've seen it at Walmart as well.

If you're visiting the brewery, they have a locator station where you can search any city/state. If you're out of town, take a look at their website to find a retailer near you. Their beer is everywhere!