Microsoft Store has them available:
http://www.microsoftstore.com/store/msusa/en_US/html/pbPage.PDPS/Xbox-One/productID.285169400
Gamestop:
In-store bundle, you have to go in the store to buy it. Call them before going. It's $1000
- Xbox One
- 8 games
- Extra controller
Amazon:
http://www.amazon.com/Xbox-One-Console/dp/B00CMQTVUA/