Have you ever been in Mintana Mills off S 25th? They have a waterfowl crumble that is virtually identical to the Dumor I started with. The differences are primarily in the trace minerals with less than .25% differences.I'm not sure I'll find cheaper feed. There isn't a local feed store that does poultry feed (all the money is in large animals here and it's a well known fact) and shiptons is more expensive for the same stuff.
I'll be shopping though anyways once weather gets better. Also looking into starting to do fodder for at least the penned birds occasionally
The feed is also part of a CHS program where the eleventh bag is free. A nice bonus for a feed produced closer to home and available from a mom & pop supplier.