Make sure you pay attention at WalMart.  A lot of times the bigger packages cost more than the smaller.  They had a family size of double stuff Oreo's the other night and a party pack of double stuff Oreo's which was even bigger and cheaper, until you read by the ounce, then the larger package was higher than the smaller by the ounce.  I go by the cart load.  I can get a cart full at Aldi's cheaper than I can at Walmart.  Aldi here recently got bigger carts, but I can still get by cheaper, but some things at Aldi's I don't care for, so I will get those at either Walmart, or our local grocer.