I use Nutrena Feather Fixer. For a commercial feed it has been pretty good. Others may have had different experiences with it but my birds are doing pretty well on it. I get it from the feed store on Ajo at Camino Verde and it is always fresh. Tractor Supply has it too, according to their website, but it is more expensive there and I don't know how often they rotate their stock.
Feed store stock rotation is critical. If they don't rotate their stock frequently you wind up with buggy and possibly rancid feed, regardless of who made it. A few bugs are just "added protein." A lot of bugs will significantly degrade the feed quality. And a few bugs can become a lot of bugs in no time at all. If you walk into a feed store and see bugs crawling all over the stacked feed bags, shop elsewhere.
I ordered through the organic feed co-op for a while but it is hard storing 2-3 months worth of feed at a time when you have 50+ chickens and limited storage space. They do have good feed, though.