Sorry if this is a repost.
Trade in an old Xbox 360 get $100 off a new one. They have the 4GB for $129.99 so it works out to $30 for the new Xbox.
XBOX 360 TRADE-IN PROMOTION
SAVE WHEN YOU BUY A NEW CONSOLE!
* Trade in your old Xbox 360 and SAVE $100 on a new one!
* Offer applicable towards a new Xbox 360 4 Gb Kinect Bundle OR a new Xbox 360 250GB.
Valid until April 30th 2011. Offer applicable towards selected Xbox 360 consoles. Offer may be discontinued at any time. Valid in Canada only. Trade credit not offered at all EB Games/Gamestop locations. See in-store for complete details.