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If you plan on getting or have already picked up an Xbox Kinect for Christmas, you might want to take a look at the sale that Amazon just launched. They have a bunch of Xbox Kinect compatible games marked down to $39.99 shipped [2]! Here are just a few of the titles that are marked down:
Kinect Sports
Kinectimals
Joy Ride
Zumba Fitness
Fighters Uncaged
Adrenalin Misfits
Sonic Freeriders
Your Shape: Fitness Evolved
(Thanks SD!)