I voted "I have more than one cat" automatically ... and then remembered again that I lost my 19-year-old "kitten" recently :-( and am down to one cat.
I didn't vote "prescription" or "store-bought" food because I buy schmancy expensive natural food for them. So pricewise, it's like prescription, but it's more holistic/natural-fancy as opposed to medical-fancy. I just figure if they're eating more or less the same thing every day, and it's from a can or a bag, they can at least have the good stuff. I used to make food for my dog, but then I had a kid and it got to be too much.
The other thing that we do that reflects money (though not so much time/effort) is use a vet that makes house calls. It costs somewhat more, but it's worth it for having the critters be calm, plus we don't have to get ourselves there and wait in a waiting room, so it does save time and we can rationalize it to ourselves that way.