Depending on if the cat has been fixed and if it lives indoors:
-Spay/neuter (If they're not already fixed): about $ 75
-Litter and litter box for a year: about $ 80
-Annual shots and vet exam: $ 100 - $ 250 (depending on where you live and your vet, clinics can be cheaper)
-Food (widely depends, I buy premium food and spend about $ 150/year, you can probably buy a grocery store brand for about $ 75/year): about $ 75
-Toys (totally up to you): about $ 30
-Treats: $ 25
$ 100 bones to start give or take!
litter box
Litter
food/water bowls
treats
Cat food
toys
bed
scratching post
collar
this is not including any vet bills for getting shots up to date and what not
look on craigs list can get one for free and spoil it with toys
a lot