It's tough to say, seeing as I'm on a different continent, but I know of one U.S. brand called "Spot's Stew". I've never tried it for my cat, but I know some people who swear by it. You could probably find a source using Google.
You may be interested in a book called "Home Prepared Dog and Cat Diets" by Strombeck. There are several recipes in the book that claim to be complete and balanced that you can prepare at home.