Right now there is a Sigma Lens deal which includes the 19mm F/2.8 and 30mm F/2.8 prime lenses bundled into one discount price. You can choose either a set for Sony E Mount cameras, or the set for Micro Four Thirds cameras. I have the 30mm on my Sony NEX7 and really enjoy this lens. I may have to get a set for the new GH3 at these prices.
[Update] These sold out quick and the listing shows a Back-ordered status, but I have just verified with B&H you can still place an order if you want to take advantage of these prices and it will ship when it is back in stock. Click through the links below for the deal.