Updated on 4/27/2017. Costco offers $3 off on this item,  price is valid from April 27, 2017 through May 21,  2017. Costco March’s Coupon Book. Swiffer deal is back again on Costco’s January 2016 Coupon Book, take instant savings on any swiffer products: $3.20 off original price. Deal ends on 1/24/2016. Limit 1 per household! The price is unbeatable at Costco. […]