EasyDealEasy via eBay offers the Yeti Rambler 20-oz. Vacuum-Insulated Tumbler in Stainless for $15.99 with free shipping. Excluding the below mention, that's the lowest price we could find by $6. This BPA-free tumbler features 18/8 stainless steel construction, double-wall vacuum insulation, and a clear lid.

Don't mind waiting on your deal? Focuson_Best2u via eBay offers it in Orange for $13.09 plus $2.09 for shipping. (This item ships from China and requires two to four weeks for delivery.)