Costco Sale: Swiffer Wet Refill Cloths 60-Count $12.79 by Rhonda July 27, 2020 *UPDATE* 4/20/17. This is from the Costco MAY 2017 Coupon Book (4/27/17 – 5/21/17). Costco has the Swiffer Wet Refill Cloths 60-Count on sale for $12.79 (after manufacturer’s instant rebate), from… 0 FacebookTwitterPinterestEmail