When the Surface Pro 3 was announced, many assumed that the Surface Pro 2 would eventually hit the dirt path and fade into the sunset; and that's what appears to be happening as the Pro 2 is no longer available from the online Microsoft store.
If you go to Surface.com, you will still see that the Pro 2 content is still showing up, but if you click that 'buy' link, you will see that it takes you to a dead end. Not even an 'out of stock' or another holding page, it's a dead link.
After poking around a bit and using the sales chat function, the representative said that the Surface Pro 2 is no longer for sale on the site and that's about all there is to say.
It makes sense too as the tablet is aging and had not received a significant update since its launch. Yes we know it got a small processor spec bump, but for the most part it's the exact same device that was announced over a year ago.
If you still had your eyes on a Pro 2, it's best to start looking around now as the device will be in limited quantities if you are able to find any on retails shelves.