In the last three years have been opened any albergues.
The one in Rubiaes, between Ponte de Lima and Tui (42 km) is necesary to avoid a so long etapa. Just after enjoying La Serra do Labruja.
Another albergue, private, in Valenca do Minho. Two km. before Tui.
Another one between Porto and Barcelos. I'm not sure about where it is, but you will find in the guide you can download from AGACS website.
I'm not sure about the new albergues in Barcelos and Ponte de Lima, it will be available soon.
About the sellos (carimbos, in portuguese) a good place to obtain it is in the fire stations. A could obtain one in the Barcelinhos fire Station, a couple of km. before arriving to Barcelos.
Buen Camino,
Javier Martin
Madrid, Spain.