I am so totally interested in buying feed in bulk. We have a TSC, SS and Apple Farm Supply... Perhaps I should check there, but for two years now... I have not seen it there. (more than 50 pound bags)
Don't know where you would get it in bigger bags; definitely not TSC. Also it depends on how many birds you have. My feed always goes bad if I buy too much at once. I have trouble keeping moisture out of it, especially if I put it in a tight metal can. 2 bags at a time for 9 birds is about all I can manage to store.