SUN+BLK Total Blackout Curtains – Costco Sale! by Rhonda October 21, 2021 October 21, 2021 *UPDATE* 10/21/21. 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