SUN+BLK Total Blackout Curtains – Costco Sale! by Rhonda November 8, 2022 *UPDATE* 11/8/22. The SUN+BLK Total Blackout Curtains from Costco come in a 2-piece set that offers 104″ total width and blocks light from entering the room. Plus, the intricately woven… 0 FacebookTwitterPinterestEmail