Amazon has the Kensington K64637WW ClickSafe Keyed Laptop Lock down to it's lowest price ever— just $18.99. Can secure anything with standard laptop lock hole, including nearly any laptop, many external hard-drives, NAS devices, monitors, and more. More than 70 customer reviews average a 4.5 star rating. This is just a taste of Amazon's One-Day Back to School Electronics sale.