The Viltrox AF 28mm f/1.8 lens is now available also for Nikon Z-mount. Pre-orders are already open at B&H Photo (check also the Viltrox Amazon store and Viltrox website):
The price of the new Viltrox lens is $379. For comparison, the price of the Nikkor Z 28mm f/2.8 lens is $277.
The Viltrox AF 28mm f/1.8 lens already exists for Sony E-mount – additional information can be found here and here:
Previous coverage of Viltrox lenses for Nikon Z-mount can be found here (check also the Viltrox online store). More third-party lenses for Nikon are listed here.