This 2A "laptop brick" supply outputs both 5V and 12VDC and is terminated with a 4-pin ATX connector.
SparkFun ATX Power Connector Breakout Kit - 12V/5V (4-pin) - RobotShop
Power Supply - 12V/5V (2A) - TOL-15664 - SparkFun Electronics
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Wall Adapter Power Supply - 5.1V DC 2.5A (USB Micro-B) - TOL-13831 - SparkFun Electronics
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Power Supply - 12V/5V (2A) - TOL-11296 - SparkFun Electronics
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