That must be easier than having to get diverse things and mixing them up. I usually get cracked corn and dried mealworms from the feed store and matzoh, peanuts and sunflower seeds from the supermarket to mix in. Also get canned chickpeas and other stuff on sale as a side, along with all sorts...
I mix cracked corn, peanuts, sunflower seeds, matzoh and dried worms. In addition I buy cans of chickpeas and various beans. Then lots of scraps-vegetable, fruit and meat. Haven't been able to find sorghum (milo) at the feed store. Large bags of peanuts, millet and sunflower seed are too...