depends on whether they have had their shots, have been neutered/spayed. and you have to buy dishes for food and water, a litter box, a scratching post, cat litter, cat food, toys and you have to...
They're cheap-and cheap to maintain. If you can't get one for free by someone giving them away, the pound sells them for like 20.00 (US) The food is like 5.00-5# bag & litter is like 5.00 for 14#...