If you don't get a scratching post, don't be surprised if they start scratching your furniture. I don't know why they're expensive, it's seems like just carpet and wood. Honestly, they'll probably still scratch your stuff anyway. My cat scratches the drapes when I'm not around. No idea why it's appealing for him.

Consider pet insurance, you might be able to get it cheap, it could save you on some bills later. I've had pet insurance for my boy but on the whole I've lost money on it. It is nice to know if he had cat cancer the insurers would cover it until his lifetime limit - so I would feel better about dealing with his quality of life vs quantity of life instead of "can I actually afford this?" I dunno if it's a good deal or not, just think about it.

The initial vaccinations are not cheap, but do it. I had mine checked for feline aids, which isn't cheap, but do it if you can if you aren't sure of the cats origins. Make sure you spay/neuter, I know that isn't cheap but just do it. If it's a male cat, they can get crystals in their urethra (it's narrower) more easily and they can die from it. Cats don't have a strong thrist drive so try to supplement with wet food and make sure water is available in a few places - they tend to like running water best but those fountains can be loud for the human who also have to live there.

I got my cat a leash. They can be leash trained, you can walk them. It is a little weird though, lol, I still do it whatever he likes it.

Make sure you change your litter box like, daily if you can. The smell gets bad even though it is tempting to just do it every other day or less. My cat is fastidious and fucking yells if his litterbox isn't clean enough lol. I had a kitten who we didn't have to train to use it, she peed in the bed once and then we just calmly took her to the litterbox and she figured it out after that. No negative reinforcement needed.

Also, I just love my handsome little man 🐈! Have a good time with a kitty, they're great!