You don't need to be a member of the cooperativa to sell almonds. There are various places that will buy them off you. I heard there was somewhere in Vilalba but you will need to ask about to find out. I have no idea what the price is at the moment but it will be a matter of 40 cents absolute max per kilo and you might want to check what others are getting so you don't get ripped off. Some of the buyers want de-husked nuts ( in shell of course ) but it is very time consuming to de-husk them all by hand without the small machine that the locals use. Anyway, you have plenty of time to check it all out as your almonds won't be ripe until late summer! All the best!