jtaylo7, I've been wondering the same thing myself about using chicken scratch. I get it locally for about $8.00 per 50# bag at TSC (Tractor Supply Company). It's called 'Producers Pride Scratch Grain'. There is millet, milo, cracked corn, rolled oats, rolled barley and I might have missed one or two others.
I’ve also wondered about using Bird Seed. Walmart has 40# bags of ‘Morning Song Year-Round’ Bird Seed for approx $14.00 and when it’s on sale it can be priced at about $9.00. This stuff contains millet, milo, cracked corn and sunflower seeds.
Once I get my still going I’ll likely try both out and see how it goes. Local grain suppliers might be able to provide you with similar grains at a lower price though. I’m considering trying the ‘Sweet Feed’ recipe with my 1st grain attempt.