TRENDnet TK (TK407K) 4-Ports External KVM switch USB
The 4-Port USB KVM Switch lets you manage four PCs with just one set of keyboard, monitor, and mouse. Switch between four PCs with a simple press of a button! Separate sets of KVM cables are included ...
Pros: Low cost, cables included, easy operation, convenient
Cons: Potential system incompatibility, powered by USB