I may have my son bring me some of the "scratch and peck". He lives in Bellingham, and I live in Spokane.
I have my birds on Nutrena's "Feather Fixer" pellets. It has a non absorbed product that inhibits mite infestation. Since one of my girls has a bare bum, I am trying to promote fast molting, and quick feather production. Also preventing the mites sounds awesome to me. I have really seen a difference in the girls' feathers.
I am using Nutrena's Feather Fixer right now too. Can't be sure it is making a difference over the regular layer feed and with mites but they do seem to be molting quicker and not being completely naked.