We started feeding our cats biologically appropriate about 3 years ago, and will never ever go back! They are so healthy and have the most incredible coats. They also started to act differently...almost more 'catlike'...after the switch! We could never quite describe it.
For now, I order their food from hare-today.com. I get them ground chicken w/ bones and organs, ground rabbit w/ bones and organs, and occasionally a little ground salmon w/ bones. They love the rabbit the best! And every now and then I get them chicken wings so they can crunch the bones up and give their teeth and jaws a good workout. They also get raw egg yolk sometimes, or just a bit of celtic sea salt sprinkled on their food.
Someday when we get our farm, I'll be raising some chickens FOR pet food, and grinding them myself, to save a bit of money. Though it's not too bad right now. For three cats, I probably spend $50 a month on their food, and that's including shipping.