Valbreso Feta is so much better than the typical grocery store feta. Produced in France, but available at Costco, quite reasonably priced too! Cowgirl Creamery also has a wonderful sheep's milk feta.
An Iowa cheese that is just wonderful is Maytag Blue. Not a sheep cheese, but one we enjoy, and go out of our way to stop by their facility to pick up a few pounds whenever we go through Iowa. Yes, it's the same family that started the Maytag appliance business. You can order online, but the best deal is their "broken wheels", only available in their shop.