Good only until Feb 12, 2012, DriveThruRPG and RPGNow have a discount code that gives you 20% off several items.
One of them: the Leverage RPG!
This uses the same Cortex system that the other Margaret Weis products seem to use -- well, sort of. As I understand it they customize it slightly for each RPG to reflect the flavor of the property they're trying to emulate.
Still, the Leverage TV show seems to have a strong RPG-friendly bias, with a team of specialists all working together toward a common goal.
The SupportCode: HotJanuary2012