Keep an eye on the classifieds. I just had a few for sale a little wile back. I still have some skins left PM me if you are interested. Here is a link to the completed sale.
Check out http://www.glimmerznmore.com/shop/. They have a good selection of snake skin blanks as well as other style blanks. Gina is awsome with getting them out pretty quickly as well. You will need to e-mail them with what you want since they list back order on most everything right now but they usually have them in stock. If not, they can make what you want pretty quickly. I am not brave enough to make my own yet so this is where I usually go to get mine.