QUOTE(Xbox360XDK @ May 21 2012, 05:20 PM)
I'm new here, I'm not really a gamer, but I have a friend who has one of these Xboxes and has asked me to find out what I can about them, what they might be worth and if they are marketable if he wanted to sell one? This has the big back pack on it and a 220V power supply, does anybody know what this is?
I'm not sure the Buy/Sell/Trade section here has any of these, but I've often seen a bunch sold over at Se7enSins and The Tech Game. If it is indeed an original XDK and not just an RGH or Jtag flashed with an XDK nand, then it will be worth significantly more than a regular Xbox. And if the "big black pack" is a sidecar on the top of the Xbox where the hard drive would go, then you can jack that price up even more, possibly even double it.
You'll want to get pictures of it from all angles to be sure it is what you say it is. The only places to sell these are forums like this one, I believe. And you will need to show a lot of proof before it is sold.