We just got a call from a university student is who is moving back to the family home. She has two kittens, and of course now they have to go....
Vet exam: 35$
Deworm and de-flea - 35$
Vaccinations - (I don't know)$$
Spay or neuter - 65$ - 100
Carry case - 25$
Food - 10$ a week (depending on type)
Litter - 10$ a bag
Toys - 10$ to start
So now you're up to approx 255$ right off the bat.
Unexpected vet visits for illness (rhino, UTI etc) 50$+
This is just the basic expenses for a "free" or cheap kitten.