Meet the TurnsPro: a motorized mount for GoPro and other comparable cameras that lets you capture amazing time-lapses. It lets you select rotation speed, direction, and angle. The angle can be set from 15 to 360 degrees. Rotation time can be from 20 seconds to 10 hours.
The unit weighs 300g. It can be attached to any standard tripod. Costs under $100 at this time.