ThinkPad USB Keyboard: Top view | Old (USB Travel Keyboard w… | Flickr
Amazon.com: US English Layout SK-8845CR Compact USB Keyboard with TrackPoint for Lenovo Thinkpad/Ideapad/Desktop or Any Computers/Laptops with USB Port, P/N: 00MV946 : Electronics
A Better ThinkPad USB Keyboard Adapter : 3 Steps - Instructables