What about WWOOFing? Willing Workers on Organic Farms? The deal is free accommodation and food for 4-5 hours (or less) work helping out each day. And you learn Organic farming too. They are usually communal run (shared meals, good camaraderie etc). I did this for over 6 months in both Spain and Portugal a few years back. It was amazing! I'm thinking of doing a bit this summer after my Camino. Don't know if there is any en-route though, and some WWOOFing places might want you to commit for a week or two to make it worthwhile to them. Some people stay years!
see
http://en.wikipedia.org/wiki/WWOOF
WWOOF Espana
http://ruralvolunteers.org/WHOSTS/
Note you may have to join WWOOF to access contact lists. Let me know if you want more details.
Bye the way, the first time I heard of the
Camino de Santiago was while Woofing in Galicia
Davey