PetCo has a sale and I really want to get some milk for the shelter I volunteer at. We occasionally have kittens that need to be bottle fed. We do try giving the kittens to a different mommy kitty first though.
KMR seems to be the favorite, but i think any brand they have at Petco is ok. The only brand I would NEVER buy is Hartz- I have heard of a few instances of young kittens having seizures, they have all been on hartz brand formula. Not sure if petco even carries it, but if they do, I don't reccommend it. As Doodlebug said, make sure it is kitten formula.