Where can I find a Playstation 2 USB controller converter?

Question by aat: Where can I find a Playstation 2 USB controller converter?
Ok, so I have a Playstation 2. There are only two ports for the controller, making it so you can't plug in more than two controllers at one time. There are also two USB ports. I was wondering, is there a converter/adapter that you can plug into the USB

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