Mosiso via Amazon offers its Mosiso 13.3" PU Leather Envelope Laptop Sleeve in Brown for $14.99. Coupon code "X57UJKR7" cuts that to $7.49. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $8.31.) That's $26 off list and the lowest total price we could find. It's designed for slim laptops/notebooks measuring up to 13.3" and features a velcro fastener.