I have hit shops all across the country, as when ever we travel I always try to make a stop into the local shop to find out what kind of fishing is around, along with looking for new materials. I've never come across a shop that has deer hair that wouldn't make a good fly. The main difference is price versus quantity, depending on how easily they can obtain it from local sources. Here in Wyoming, it's very cheap at my local shop for instance, and the closer you get to Yellowstone the more expensive it gets.

Overall, I think having different seasons and types of deer is the greater good. I once ventured into a shop that had natural colored deer hair in a half dozen different shades and types. While certainly not needed, I like being able to use different types and colors of deer hair for some of my flies.