Desertrose,
Cat food here is a challenge. The selection here for natural..human grade is not like the States. You might check out the Pet Food/Vet stores that carry Royal Canin..they have 3 allergy formulas..venison/pea, lamb/pea and rabbit/pea. I am waiting for a reply from them to see if these are carried here in BA. I will post what I find out. The other reason to go to one of these combo stores is that the Vet might be able to special order for you or have something that's not on the shelves.
The other option for you is to home cook...there are many websites that give you all the information to make sure your cat is getting all he or she needs.
Best of luck!