You may be able to get these things cheaper using coupons at a regular store, etc., I'm not a super deal shopper that way, but I know their prices are reliably cheap so I buy:
snack nuts, baking nuts, m&m's, fruit strips, pringles, tortillas, refried beans, cooking spray, real maple syrup (when they have it), coffee filters, paper towel, toilet paper, tin foil, plastic wrap, plastic bags, pasta, spaghetti sauce, cheese, cheese sticks, feta, hummus, fruit, vegetables, frozen blueberries, texas toast.
I don't buy: meat or fish, flour (bleached), apple sauce (HFCS), ketchup (HFCS).