It looks like eBay isn't just popular for the PS4, but also the Xbox One, with over 12,000 consoles sold since November 1. Considering Microsoft itself sold over 1 million Xbox One units in 24 hours - at least 12,000 of those were re-sold on eBay.
7,000 of the Xbox One's sold over eBay were during the launch weekend, November 22-24. Did you get your Xbox One from eBay? Let us know in the comments.