I found a stray cat who looks sick I can't keep it, is this where I should take it

You should take it to either Animal control where they have access to Veterinary services or to a vet who may take it as a good sam drop off where it would get quicker Care. We do not intake from the public as we are not licensed as a veterinary clinic. We contract out our vet services. Petsmart does not i take from the public either.

Really they take stray animals in?

I would take it to a Petsmart.