IOGEAR GCS932U 2 Port DVI-D KVM with Audio for $69.99

Use one DVI single link monitor, keyboard, and mouse to control two DVI computers.
One tap switching is the included remote port selector switch.
Hot key switching allows the focus of the KVM and the audio functions to be independently switched between computers; listen to music from one computer while working on the other.
Reprogrammable Hotkey activation for keyboards without a Scroll Lock key
Plug-n-Play support for DVI single link monitor resolutions up to 1600 X 1200 @ 60 Hz
Supports two button scroll wheel mice, MAC keyboards and most other Wireless keyboard / mouse sets
USB mouse and keyboard emulation for error-free boot-up and instantaneous recognition when switching computers
Save space and reduce desktop clutter
No software required
LEDs allow for easy status monitoring
Molded-in cables to simplify setup, nothing else to buy