I've got a 21" monitor ATM. It's got one DVI port at the back, which I'm currently using to power my Xbox 360 and my MacBook. I get really frustrated whenever I need to switch between the two because I need to go behind the monitor and undo one and plug in the other. I looked up to see if there was some sort of A/B switch that I could just hit a button and it'll go from 360 to MacBook but all the options are actual small boxes at around $100. Is there a simpler/cheaper way to do this?