How much money do kittens usually cost?

Depends. If you're going for a purebred, could be $1000 depending on breed. A mix breed house cat from a shelter could be about $50-$60. Of course, people are always giving them away for free- just check your local ads. Most places you buy an animal from will require that you have them fixed, or will have it fixed and charge you for it. Even if you get one for free, for the health and well being of the animal, for pete's sake get it fixed!