Yikes, I thought I was paying high prices, but you folks are really paying!
I used Nutrena NatureWise Meat Bird feed on my first batch of Cornish X early this summer, and am using it again on my present mixed batch from S&G. Last time I bought it (a month or so ago), I paid $9 for a 40# bag. I need to make a run to the feed store here in the next few days for another 25 bags or so, and I'll try and remember to report back. I think earlier this summer it was closer to $10 per bag. Still, that seems to be a great price compared to what others are reporting. I really can't compare it to any other feed since that's about all I've used, but apart from having GMO grains in there (which is unavoidable unless you want to spend >$25 per bag around here, if available at all) I'm happy with it.
Actually, I did use a bag of chick starter/grower from ADM when I started my first batch, and didn't like it. Don't know how to explain it, except that it just didn't smell right. Not bad or off, but not fresh and wholesome either. The NatureWise smells much better.