Strohecker's is good. I think you'd have trouble putting together a complete list of all the ones available in the US. If you mentioned the state you're looking in or the nearest metropolitan area we could probably get you a short list to work with.
When I tried to find one, I had a lot of luck googling "compounding pharmacy" + my town. I live in a pretty big place and there were only a few, so if you're somewhere more rural you may have to rely on one like Strohecker's that does mail order service.