Costco: July 4, 2018 by Rhonda July 16, 2020 7/4/18. Happy 4th of July! Costco will be closed today. 0 FacebookTwitterPinterestEmail previous post Costco Sale: Cascade Mt.Tech Carbon Fiber Trekking Poles $24.99 next post Costco: Cuisinart Mandoline Slicer $19.99 You may also like Plush Holiday Snowmen Set at Costco! Harrison Corner Desk w/Lift – Costco Sale! OXO SoftWorks Non-Stick Skillet Set – Costco Sale! Sea & Sand 7-Wick Candle at Costco! Medley 3-Pc Oven to Table Set at Costco! Holiday Lantern Globe w/Lights at Costco!