You're long gone, but just in case anyone else is interested: Check out the
Planeta Agua store in Logrono. Along with their fishing focus, they claim to be Camino specialists (so said their flyer and map w/location, which was in a small box on the Camino going into town). Based on my experience, they were good to go.
I bought a pair of light Spanish boots, a pair of coolmax liner socks, and a Nalgene water bottle there. They were nice folks - the woman behind the counter showed me the two "hot spot" streets in Logrono with the best restaurants. And she even gave me a tiny souvenier gourd (which I later lost - bummer).
I'm not sure of their exact location - all I remember is that they were up the street from the police station. I'm sure you or any other curious folks can Google them to find out where they are
Here's some address/contact info, though (from Google):
Avenida De Navarra 8-10
26001 Logroño, Spain
+34 941 252 764