Costco.com 4th of July Sale! by Rhonda July 5, 2021 7/4/21. Even though Costco stores are closed today in observance of Independence Day, costco.com is open and is having a huge sale! Check out hundreds of deals at costco.com, while supplies last. 0 FacebookTwitterPinterestEmail previous post Costco Closed on the 4th of July next post Savannah Fabric Hamper with Lid – Costco Sale! You may also like Kitteridge Tall Chest at Costco! T3 StylePlus 1″ Flat Iron – Costco Sale! T3 Featherweight StylePlus Pro Hair Dryer – Costco... Craft + Main Westbury Accent Console at Costco! Shark HyperAIR Hair Dryer at Costco! Midea 4.5 Cu Ft Compact Refrigerator at Costco!