4 Port VGA KVM Switch for $0 + shipping cost
 

See [url=https://www.amazon.com/Wireless-Keyboard-Connection-Switching-Function/dp/B071Y6C516/]here[/url] for details. I used for several months to manage my desktop PC and 3 crunching micro-PCs, worked great, but in the end decided to use USB-wifi sticks for the 3 micros.

Paypal me $10 (via e-mail [url=http://www.mersenneforum.org/mayer/README.html]shown here[/url] to cover USPS priority shipping - sorry, US only - and it's yours.