DataComm Electronics
The Flat Panel TV Cable Organizer Kit with Power Solution comes with everything needed for installation:

Recessed Cable Plate with Power

Recessed Cable Plate with Straight Blade Inlet

6 Ft. Extension Cord

Two (2) Old Work Electrical Boxes
Plastic (50-3323-WH-KIT) or Metal (50-4423-WH-KIT)

8 Ft. Non-Metallic Electrical Wire (50-3323-WH-KIT)
7 Ft. MC Cable (50-4423-WH-KIT)

Two (2) Redi-Loc MC Connectors (50-4423-WH-KIT)

Three (3) Wirenuts

Mounting Screws

Installation Instructions

Note: You will need a sheetrock saw and screwdriver to complete installation.  50-3323-WH-KIT shown above.
Flat Panel TV Cable Organizer Kit with Power Outlet