Keep your coffee warm with this Mainstays self-warming coffee mug! For a limited time, head over to Walmart.com where they are offering this Mainstays Self-Warming 12oz Coffee Mug with Mug Warmer Coaster and Lid for only $27.88! Shipping is free for Walmart+ Members or on orders of $35+; otherwise, shipping adds $6.99. You may also […]