I have good news and bad news for you. The good news is that I was taken by the small statues of Saint James the Pilgrim also. Then, right on the camino, I walked past a shop (on the left) selling them. One was on display in the window. I took some pictures of the shop and its business address. This was last year (2015).
The bad news - my SD card snapped before the end of the camino and I don't have a backup of those shots. I'm remembering that the shop was in Estella, I hope I'm right.
I like online search challenges and I tried to find something for you but I had no luck either. Perhaps there is something like a chamber of commerce in Estella that could help. Shipping must be quite expensive.