...unironically, I'm a little surprised something like that isn't a legit thing.
I'd buy the FUCK out of a brand that contributed a dollar toward my student loans with the purchase of their cereal or macaroni noodles or w/e. So long as the price tag isn't jacked up a dollar to offset - if it's a net saving and the volume of food is comparable, I could forgive a lot in the taste or quality department.
Hell, I'd make entire meal plans around that brand. Gotta eat anyway, so it's a win for me; and while their profit margin wouldn't be as high as a purchase from a non-student-loan-debt-slave, the massive uptick in brand loyalty would be a win for them.