BHPhotoVideo has the Sigma 16mm f/1.4 DC DN Contemporary Lens for Sony E-Mount cameras for $449 – $50 w/ coupon code BHWPPI18. No tax for most states.
Found this through a Google Shopping search. This is one of the most popular lenses for Sony E-Mount cameras right now. Excellent deal for a brand new lens from a reputable dealer.
I’m not sure if this code applies to other lenses as well, but this was the one that I ordered.
Link to the deal here
Also available is the Sigma 30mm f/1.4 DC DN Contemporary Lens for Sony E-Mount for $339 – $25 coupon BHWPPI18 = $314. Link here
Both are great lenses.