Sony VGPAMC9/G Reversible Laptop Sleeve (Green) for $9.97.  Add it to the cart to see the discounted price.  Shipping is $2.99 for a total of $12.96 shipped.  Here is a screenshot for your reference.  It is made of nylon and fits laptops with up to 15.6" screen sizes.  Most places have it for about $29 or more.