Kensington ComboSaver Notebook Computer Lock for $14.95 shipped after this $10 rebate.  Here is a screenshot for your reference.  It fits in the standard Kensington security slot found in many notebooks, flat panel monitors, projectors, printers, docking stations, tablet PCs and other devices.  The cable lock is 6-feet in length, and features a 3.5mm steel cable.  Most places have this Kensington lock for over $24.