Bigyin suggested in another post that it would be nice if everyone posted the details they know of which co ops take what. I thought it was a good idea and seeing as you had this title already thought this might be a good place for it.
So here is what I know...
Ralda SL in Santa Barbara takes Carobs(you have to register with your deeds but this is easy, I can give anyone more info if they want it).
There is a backstreet Moli Doli in Amposta that takes Olive and carobs with no questions asked(no deeds, nie or anything required, I can give exact location if you need it).
The other Coops in this area that I know of require membership.
Anyone else?
Bruixot