should run around $40-$50
you can use this as reference.
http://www.gmpartsdirect.com/catalog/
once you select your vehicle.
use the following tabs to get to the license plate lights.
All Vehicles -
2010 -
Chevrolet -
Camaro -
SS -
ELECTRICAL -
REAR LAMPS -
LICENSE LAMPS -
Part # 92212896 - License lamp 2010-13