Costco Sale: Columbia Mug 6-Pc Set by overandback $9.99

*UPDATE* 8/30/17. Oh my goodness, overandback has done it again with this gorgeous stoneware coffee mug set. Costco has the Columbia Mug 6-Piece Set by overandback on sale for $9.99 (after manufacturer’s instant rebate), now through September 27, 2017. That is $3 off Costco’s regular price of $12.99. It’s while supplies last. Colors include either blue or red (selection may vary by location). (Beige is not being offered at this time.) Features:…