You can buy the Sigma 19mm f2=8 DN on Amazon – http://amzn.to/2rRI6Cs
From the review:
More or less at the same time we got the Sony A6300 (which we just reviewed here on LensVid) before Photokina 2016, we also got two Sigma E mount lenses – the 19mm f/2.8 and the 30mm f/1.4. Today we are going to look at the first of these two lenses.
One of the biggest advantages of mirorrless cameras is the size – having a compact camera that you can take anywhere. The problem is that if your lens are still big and heavy you lose this advantage. This is why Sigma’s current E-mount line of lenses is so interesting – it offers several very compact lenses with fast apertures with a nice extra bonus of being extremely affordable.