Sierra Trading Post offers the Stanley Adventure Stainless Steel Pint Mug in Green for $5.50. Even better, coupon code "ETJXR0517" nets free shipping. That's the lowest price we could find by $4. This 16-oz. mug is dishwasher-safe and features a BPA-free press-fit lid and neoprene insulating wrap that keeps beverages cold for up to four hours. Deal ends May 6.