A few hours ago, Derpy went back up for sale over at Hot Topic! It looks like the fixed bubble version from the image, and I don't see any other changes. Chances are its going to disappear in a few hours after this goes up, so be sure to grab one if you want one (assuming it follows the trends of the last few times it went up in stock).
Find it here!
Update: The less rare, but also hard to find Rainbow Dash is also available. Find it here!
Thanks to Bl8demast3r for the heads up