Amazon is now selling regular Xbox One consoles (read: not the special Day One editions available at launch).
This comes just after Best Buy made available a slew of Day One consoles and then immediately sold out of them, so it's not certain how much longer they will be available. Though it's worth noting we just purchased one, but I'm assuming they will go quickly and we have no idea how many Amazon actually has in stock.
These are just plain ol' Xbox One consoles, void of any special markings or extra game pairings that you might find in a bundle.