The horse minerals work very well and are quite easy to find in 25-50 lb bags. I like to use Goat blocks, they are 18-22% protien and very high in vitamin and mineral content, I just place one in teh grow out pens and they last about 2-3 months.
old*cowboy :
Is the Harrah store back up and running. I fed their feed for awhile and my birds loved it also. I liked it a lot too as it was less expencive. But it got to where it was hit and miss on them having it on days I was in OKC. So I would have to buy something else and  I hate flip flopping feeds.  I have since talked to Big V out of McAlister and they told me Weatherford had a coop that sold their feeds. I called the coop and they said they did not carry the gamecock ration, but would if there was a market. I told them how many I know in this area that would feed it, so they brung in a pallet last week. Its 2 dollars a bag higher than the Harrah feed, but they told me they would keep it in stock so that in itself is worth something. Then when you consider I only bought Harrah feed when I was in OKC at doctors, this way I dont have to make a special trip to OKC if I run out and dont have to be in OKC already. The Black rooster from Big V is much cleaner and the birds seem to like it well too.  Have used horse mineral and it works good.
Horse minerals it is. I do have a full bag of sheep minerals (has a lot less copper), I guess I could use that until it's gone. Horse minerals make sense to me as they're getting vitamins and minerals in their other food anyway, I'm just not sure how much exactly. If they happen to need more they'll at least have access to loose minerals.
The guy at Guthrie Grain had told me a month ago they'd sold the place, then the other day he told me the deal fell through and they're just flat closing it. They've pretty much got all their stuff sold out. I really like that older guy, Jerry, a lot that works there, too. Nice guy and always so friendly. He said Harrah will be mixing it at their plant, I asked specifically. Course we all know how that can change, too. I really love this stuff. I can call a week ahead once a month if I need to. If it gets to the point that they don't have it on a regular basis I'll have to figure something else out. I'd love to find someplace that sells Black or Red Rooster around here. I *think Shawnee is the closest & that would be fine since I'd only go once a month. I'd like to switch out one for the other every month. I bet that'd be good for the birds in addition to the Nutrena All Flock. Slightly different ingredients, give them a bit of change every month. Great idea you just gave me lol
old*cowboy :
I may have bragged prematurly last night Teach. It is sleeting outside now. 
Yea, looks like I should've kept my big mouth shut, too.
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Thanks for the input. I didn't realize so many of you use minerals with the chickens. Such a good idea, too.
I quit feeding the Harrah feed because I was left high and dry twice on feed, and then no one would answer the phone at that store over a period of four days. I switched to black rooster game feed, and I mix in an equal portion of sweet grains, half that amount of oat extender and a quarter that amount of floating cat fish food. 
50lbs black rooster
50lbs sweet grains
25lbs oat extender 
12.5lbs cat fish food
That makes it 16.5% protein, and 3.25% fat, at a cost of roughly $12.75 per 50lbs. Would be a lot easier if I had a concrete mixer.