I found this a couple days ago, haven't had a chance to try it yet.
You install software on up to 4 host PCs connected to your network then connect the KVM remotely via CAT5 or 6. It claims to do 1920 x 1080 on DVI, 2 USB ports for Keyboard etc, Audio, and 4 PC switching. All for $30.
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
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