This used keyboard is no longer available from Apple, but see here https://discussions.apple.com/message/25158125#25158125 why it is preferred.

The Apple keyboard features the compact design of the Apple wireless keyboard and the elegant, ultrathin anodized aluminum enclosure and two USB 2.0 ports of the Apple keyboard with numeric keypad. The keyboard has low-profile keys that provide crisp, responsive feel as well as function keys for one-touch access to a variety of Mac features such as screen brightness, volume, eject, play/pause, fast-forward and rewind, expose, and dashboard. Its compact design fits on your lap or on even the most crowded desk. And two USB 2.0 ports enable you to connect your Mighty Mouse as well as a high-speed peripheral such as a digital camera or printer.

MPN: MB869LL/A Keyboard/Keypad: Keyboard Interface: USB Model: A1242 Connectivity: Wired Connections 1 x USB - 4 pin USB Type A Operating System Required Apple MacOS X 10.5.6 or later Color Anodized aluminum, White

Dimensions (approximate) Width 282mm Depth 115mm Height 15mm

This keyboard has hardly been used, and is in excellent condition. Include a free Apple mouse as the photo.

it still comes with the original box.