I get them from Dr. Grzegorz Skiba at Omaha Pain Physicians in Omaha. He is the only doctor that I have found in Nebraska that does them. He and his staff are amazing. I would highly recommend him. He is very innovative and knowledgeable about CRPS and various other medical conditions. He even does stem cell treatments. He is a great listener and will never try to talk you into a procedure you are uncomfortable with doing. Here is a link to his website:
http://www.omahapainphysicians.com/index.html

Hope this helps!