Echo Store via Amazon offers Prime members the Slicoo Soft Touch Case and Keyboard Cover for Macbook 15.4" w/ Retina in four colors for $12.99. Coupon code "2VCIWUNZ " cuts it to $8.99. With free shipping, that's $8 under the lowest total price we could find for similar protectors elsewhere. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.59.) It's made of plastic covered in rubber.