From January 1, 2017, a new Sigma lens price will increase in Europe. Almost all the Sigma lenses for all mounts (MFT, Sony, Nikon, Canon) will be impacted.
According to the NikonRumors, the new prices will be higher between 9% and 28%, so you can now check the lowest prices at 2016 Black Friday & Cyber Monday Sigma Lens Deals.
Source: Nikonrumors