Based on experience with one pet store in my area (American Kennels) . . .
The price of the store-bought cat was twice what a well-known breeder would charge. If you buy from a home-based breeder who is far away, you will have to pay for transportation, but even with transport, the cost may be far less than that charged by a pet store.
Very little paperwork provided by the pet store. All they gave the new owner was a vaccination record.
Sick cat who needed extensive treatment.
The cat from the pet store was comfortable being handled by people and made a great pet.