Are you talking about the 30lb bag? There are no dog foods that I'm aware of that come in bags larger than 30lbs.
You can try an even higher quality food like Orijen ... typically the higher quality the food, the less the dog needs to eat of it. Orijen is more expensive though.
How many dogs do you have, what are their ages, and how much are you feeding them every day?
My boy Kane eats ~3-4 cups every day and his latest bag of TOTW has lasted him since mid-December and will probably make it through the end of the month.