I buy 50lb bags of rabbit food at the local feed store for about $13. If you're wanting bulk, you should definitely find a feed store. As far as I know, most pet stores don't sell rabbit food over like 10lbs, and even that is going to be really pricey. Again, like stated above, unless you have a lot of rabbits (I go through 50 lbs about every 3 weeks), the food will go stale if you don't store it properly.