i don't think so, im pretty sure they would make them sick, since they werent designed for rats
i only pay around $8 for a three or four lbs bag, and that lasts around two weeks to a month
i get my food at petsmart
you could try making ur own food
maybe u are feeding ur rats too much, are they overweight?
you could order a few bags of food from the website, and for like the regular $40 you already spend you can get like three or four months of food, including shipping, and i also feed my rats another food mixture, full of seeds and lab blocks and corn and stuff, on top of the regular blocks, and they love it