Hello fellow lemmings!

I am in need of some advice on how to expand/coordinate my workstation.

I currently have 2 monitors and 2 laptops with 1 docking station that I switch back and forth between (I do have a second Bluetooth mouse that I connect to the laptop that is not currently connected to the docking station, if I need to).

I would like to have 4 monitors by the upcoming tax season. Also, I would like the option to expand to a total of 3 laptops within a couple years.

I have looked into KVM switches and the only one that I can find for 4 monitors and 2 computers is upwards of $800. Is there a KVM switch out there for 4 monitors and 3 computers, or is this just a pipedream?

What other solutions should I consider? When I expand to 3 computers in the upcoming years, would having 2 workstations be cheaper/more efficient?