Deconovo via Amazon offers its Deconovo King Water-Resistant Pillowcase 2-Pack in White for $18.99 $16.99. Coupon code "COU3YUQV" cuts it to $9.49 $8.49. With free shipping for Prime members, that's $10 off and the lowest price we could find. These cotton/poly terrycloth pillowcases are machine washable and feature a super fine invisible zipper. Deal ends May 29.