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Curious Inventor - Store: Plug-In Bread Board Power Supply Module (Kit)
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in stock - price: $13.99
Plug-In Bread Board Power Supply Module (Kit)
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short description:

This power module plugs straight into common bread board sizes, giving you 3.3V or 5V (and more) of regulated voltage on your supply lines. It features a barrel jack that lets you plug a wall-wart straight in, or alternatively, screw terminals for neatly attaching stripped wires.

more information and instructions:

See the main Bread Board Power Supply Kit page for full specs, features and instructions.