happy labs, I feed grain free wet and dry. Grain free wet is tricky, it's difficult to find a brand both of mine will eat. Wellness wet seems to work for me, though they like Royal Canin the best, even though it is NOT completely grain free, it is fairly close and they will both gobble it up!
For dry, mine go crazy for Blue Wilderness Duck or Chicken or Solid Gold Indigo Moon. The Solid Gold is a little cheaper, but both of these foods are so good price isn't the most important thing.