Healthy and cheap alternative to Beneful dog food?

Hi. I'm feeding my dog Oliver Beneful dog food and I know it isn't good for him. I gave him Innova once but my parents said it cost to much money and they couldn't afford to spend that much on him. I'm only twelve years old other whys I'd get myself a job and buy it myself. I have eighty dollars saved up but I don't really want to spend that much on him either and I am saving up for something else. I'm personally at my wits end when it comes to this situation, I want my dog to have a long healthy life but I also want my family to be happy. If anybody knows of a healthier alternative thats about the same price maybe a few dollars more I'd really appreciate it. By the way I know I'm too young to be on this site but I really need help with this!