I didn't know Niño had epilepsy! Yikes. Well, I don't know what kinds of food they sell at the last two stores you mentioned, but a few brands tend to be more accessible than others. This includes Canidae, Wellness, Chicken Soup, Solid Gold, Innova, and Blue Buffalo (if they still sell that kibble at PetSmart). I KNOW that a $40 bag of Canidae will last you at least a month so you shouldn't have to worry about the prices of any of these brands.

$60 a month is what it takes me to feed both Giselle and Lucky

Have you visited Naturapet's website? They have a store locator so you might find one near you.