How much do serval kittens cost?

First of all, there is no such thing as an average kitten. They are each King or Queen of all they see, including you. You only live to serve them.

Second, in Southern California, 30 - 40% of cats in Animal Shelters are euthanized. Some of them before the 'legal time limit', it seems. For less than $50 (American) you can save a lifelong protector. An arch-backed, hissing cat is a formidable adversary, and they WILL sacrifice their life for yours faster than you can blink.