Blue Wilderness Grain-free is sold at Petco - or I think it is, I've never really bought one there since I get mine from the feed store. But, I see some Blue Buffalo stuff in there.
By the way, if you put your zipcode in Fromm's website, it will show you lots of places that sell Fromm in your area. Well, at least it does in my zipcode. I just found out yesterday that the Pet Supplies right down the road from me carry Fromm! There's also several vets and pet botiques here that carry it.