DVI Switcher (not kvm switch)

Hello,

Here's the situation I have right now. I have one monitor as main, another monitor to my right on the side. Both monitors are connected to its own PC.

However, sometimes I would like to have both monitors switched between computers with a simple switch instead of needing to switch the actual dvi cables behind the pc's.

Is there a product out there that does this? The only stuff I could find are kvm switches which won't do what I just explained.

Thanks,
Calvyno