Camino de Santiago de Compostela

My dad and I are planning to bike the camino at the end of September. We'd like to rent or buy bikes when we get to Europe to avoid the hassle of traveling on the plane (and he wants to ride an e-bike, which he doesn't currently own). We plan to start in Saint-Jean-Pied-de-Port, France - does anyone here have any recommendations on how or where to acquire bicycles? We are looking into buying plane tickets now, and will probably fly into a major city like Madrid or Paris (or even Frankfurt) and then take a train to Saint-Jean-Pied-de-Port. Perhaps there is someone somewhere along the way who is looking to sell or rent their bikes??? That would be perfect! I normally ride a 52cm frame and would prefer drop handlebars, since flat bars aggravate a wrist injury.