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It appears that two of the Xbox 360 SKUs will receive a $50 price drop by the week of Sept. 7, making the 60GB model $299 and the Elite $399 --
Update: Oh mercy, it's been a long day. The Arcade is marked as $199 in the flyer as well (under the TV, to the left). Thanks, Strike Man.
[Thanks Patrick, Master X, and everyone else who helped.]