NewEgg.com has the IOGear GCS42U-W6 2-Port USB 2.0 KVM Switch for $19.99 with Free Shipping when you use coupon code: SWITCH69FS. Coupon expires June 16, 2009.

This KVM switch enables users to share the monitor, USB keyboard and mouse among two computers. KVM cables are included and there is no software to install. There’s no keystrokes to remember and is completely bus powered, eliminates the need for a power adapter. It works with virtually any OS that supports USB devices (Mac/PC/Linux).