XFPS 360 - Keyboard / Mouse Adapter

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Hey there. I really want to play FPS games using a mouse and keyboard on my Xbox360. How much should I be looking to pay for an XFPS adapter? I have only seen a few for sale, which are quite expensive.

 

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It really doesn't need to. This is NOT a keyboard / mouse VS controller thread. This is a question about the pricing of an unofficial peripheral which will allow me to play a particular genre of game they way I prefer.

Nor am I asking where to find them, I just don’t want to get ripped off