This doesn't look very legit. More like a bootleg version.
Why is it pictured in a cardboard sleeve? And look at the release date: 2013-3-13. So the listing is saying this was released on March 13th of this year, six months ago.
If this was legit, you'd be able to buy it anywhere and Disney would have already announced it a long time ago.
So unless the date is incorrect and they meant to say 2014 instead of 2013, I feel this is bogus. Just someone selling DVDs they burned from episodes they downloaded. The site says "buy now", implying it's available and will be delivered now rather than being a pre-order.