3 Way Switch - Where to get?

[sssutututu]

Hey so I want to do a setup as the pic below, but I have went everywhere in my local town and I cannot find a change over switch that would work and wonder if they have any hiding on the online stores, also just can't find one.

I am most certainly not looking to run the whole house or a part of it, It's just for my 2 Computers, Speakers, and 2 Routers