newegg offers the Kensington SP17 17" Classic Sleeve Notebook Case in Black, model no. K62567US, for $17.99. Coupon code "MEMRDAY13" drops it to $11.99. With free shipping, that's the lowest total price we could find by $8. This laptop case features a padded compartment, interior document storage pocket, detachable shoulder strap, and carry handles. Coupon ends May 27.

Note that Amazon charges the same.