u/Admirable-Shift1856

I am getting a birthday gift for my siblings their birthday is soon and my brother has been begging for a cat for 3 yrs now and i thought this might be the time I will be paying for everything I was thinking of adopting from a shelter near us that cots like $300-$500 but they do all the important vet stuff like vaccine, microchip and flea treatment but I was wondering how much more I would have to spend on things like the litter box and food bowls and I was also wondering how much the monthly expenses would be(not including vet visits or toys)