Nature's Domain is great! I use the salmon formula for my pit-hound mix and she is wonderfully fit and shiny. We feed her on the lower end of what they recommend because treats/people food are a common occurrence, especially now while she's still in training.
That being said, we've never fed her anything else really (I think we had a small bag of one of the other grain-free foods when we FIRST got her but as soon as we saw the price of this one, we abandoned ship on the other).
ETA: I know your question was about the price, but another poster covered that and I just wanted to show my support for this food, haha.