Bot New KVM Switch

Rosewill RKV-4UC 4 Port USB Cable KVM, 0.9m Cable Built with Speaker
MIC Remote Flip Button - $24.99

I paid about that for the old one that just had two connectors, quit using
it 'cause it was a little flaky on the handoff. This one does it with buttons
so that ought to work fine.

It's a newegg Shell Shocker so I don't know how long they'll last.
The newegg product page