We've just been helping with a Brittany in Mallorca that's been fed on bead only - thankfully a member has taken him on to foster until a permanent home is found. He was in the most awful state and we think his bones and internal organs have been affected.
Sorry, didn't read your post properly that the food was to send out to rescue - even cheap food is far far better than bread. Do they have anywhere where money can be donated? Can't help with prices of cheap food, sorry, don't buy it.