ThinkGeek offers the Undercover Manila Tablet Sleeve for $11.99 or Notebook Sleeve for $17.99. With around $6 for shipping, that's the lowest total price we could find for either sleeve by at least $2. This large padded and tough foam sleeve looks like an old envelope. The tablet sleeve measure 10.5" x 9" and the laptop sleeve measures 16.46" x 12.68".