There's a charity listing from GamesAid (a UK games children's charity) currently running on eBay for that white Xbox One! The one given to members of the Xbox One launch team.
The auction will conclude this Friday, November 8, at 3PM UK time. The item will be shipped "immediately post launch" on November 22.
The price is a bit...well, pricey - but if you're doing it for charity!
http://www.ebay.co.uk/itm/Xbox-One-W...-/141108113747