Costco.com 4th of July Sale! by Rhonda July 5, 2021 698 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 Costco Business Center Coupon Book: APRIL / MAY... Costco Hot Buys Sale: 3/29/25 – 4/6/25 Permasteel 46″ Rolling Work Bench at Costco! Bond Bloomington Cascading Cup Fountain at Costco! Costco Unadvertised Sales! MARCH 2025 Costco Coupon Book MARCH 2025