Oikos Whole Milk Yogurt cups are free with a triple stack at Walmart! Buy three Oikos cups for $1.00 each, and use a $1.00 coupon from the 1/29 Smart Source insert. Pay $2.00 out of pocket. Next, redeem both a $1.00 Ibotta rebate and a $1.00 Checkout 51 rebate. The $3.00 in savings makes all three yogurts free.