Good high quality dog food?

Good high quality dog food? I'm thinking of changing my dog's food, what would be some good high quality food to check out? Are their any cheaper than science diet? my 6 month puppy is on the science diet large breed food right now but I've heard science diet isn't all that great and it's just overpriced for what Geo's in it I think you should you can get some good dog food's in the dollar store's,I'd say yes their cheaper it's overly priced..