With purchases of $25 or more, Amazon offers Prime members the AmazonBasics 13.3" Laptop Sleeve in Blue or Purple for $2.44 with free shipping. (Non-members can spend $35 or more to qualify for free shipping.) That's a few cents under our expired mention from from earlier this week, $8 off, and the lowest total price we could find.

Note that this item is sold as part of Amazon's "Add-on program" and can only be purchased with an order of $25 or more.