I think most of the Ranch-Way mills on the front range are now carrying an organic layer (and organic feeds for other animals, too). They have a 16% and a 20% layer, comes in 40# bags. It's about $22 for the 20%, which I'm feeding right now to help my girls through a moult. They seem to be doing well with it, though I wish it was a little less powdery - it has almost a flour-like consistency. I asked them about this and they said they have only one grinder for all their organic stuff (has to be kept separate) and they can't get a coarser grind. They have a "scratch" feed, too, that was also way too fine a grind - just blew away. But I was thrilled that they're going this direction, and I'm willing to pay the extra. But do check out GardeNerd's thread. She has a couple other options on there - one is for pick up in Boulder or Golden, I think.
ETA: the layer is apparently designed to be fed in conjunction with the scratch feed according to the weight and production phase of your hens - this is according to their site. My hens free range most of the time, so I haven't been feeding the scratch. I did email RanchWay to ask why they don't provide a complete organic layer ration, waiting for a reply. Their site has the location of their dealers, there are several in the Denver area, so you should be able to find one fairly near. Theirs is by far the least expensive route I've found do go, though it still ain't cheap!