Groupon offers the Timbuk2 Classic Quickie 13" Notebook Sleeve in Black/Gunmetal for $19 with free shipping. That's the lowest total price we could find by $40. This sleeve can hold most 13" notebooks and features exterior pockets, D-rings, tuck-away handles, removable shoulder strap, and more. Deal ends September 5 at 12:59 am ET.