Check out the 80-CD Filing Box from TinyLiving. The box is lockable, and with a one-touch gliding drawer. It holds the CDs/DVDs in sleeves, but is not compatible with jewel cases. The box retails for a reasonable $29.95, and is stackable (see on pic on the right), though sleeves would have to be purchased in addition to the box.
Want to keep your CDs handy, and out of the hands of the wrong person?