gigacity_amn via Amazon offers the Gmyle 13" Nylon Sleeve for MacBook Air/Pro in Khaki/Olive Green (pictured) for $15.98. Coupon code "PRVNGPL6" cuts it to $7.98. Plus, Prime members receive free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $8.64.) That's $8 off and the lowest total price we could find.

Of note, also available from gigacity_amn via Amazon is the Gmyle 13" Felt Sleeve for MacBook Air/Pro in Dark Gray/Brown for $19.98. Coupon code "2EJK5WS7" cuts it to $9.98. Plus, Prime members receive free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $8.64.) That's the lowest total price we could find by $10. Both sleeves feature padding and a soft interior in order to protect from knocks and scratches.