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Curious Inventor - Store: Adjustable Voltage Regulator: LM317T 1.2V-37V
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in stock - price: $0.49
Adjustable Voltage Regulator: LM317T 1.2V-37V

short description:

With sufficient heat sinking, this device will supply up to 1.5A. Just pick two resistors to set the final output voltage.

more information and instructions:

You can see a circuit digram and formula for picking the resistors at our plug-in bread board power supply kit page.

Holding it so that the heat sink is away from you, the pins are:

Left: Adj, Middle: Out, Right: In

spec sheet.