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Maybe they have more stock of the space gray and want to clear it out faster. Who knows.
 
I bought the space gray a few months back and it was $2099 at that time, the silver was $2049 at that time as well. They both been bouncing around from $600-$750 discount on each model since labor day. It probably just depends on what's selling and how much stock they have. No difference on the inside.

I almost wished I would of saved the extra $50 for Silver but that was Monday morning quarterback.
 
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