Natural Balance has a Fish and Sweet Potato kibble, I pay around $45 (tax included) at my PetCo for a 28 pound bag, I feed (2) 65 pound dogs and it lasts me around 3 1/2 weeks feeding both of them. It's the limited ingredient diet line so the only protein source is fish and it is grain free. Just another option as it isn't too high in price, relatively easy to find, and is a decent food. And it's worked GREAT for my colitis and allergy dog.
Tyson, white, 4 years, Boxer & Thor, 2 year old GSD
Tiger and Raven, kitties, 10 and 11 years
Erin flashy fawn, Lucas, Flashy Fawn, Boxer angels, RIP 11-29-10 and 8-22-07