Amazon.com : Altura Photo AP-305N Camera Flash Light with Manual Trigger for Nikon D3500 D3400 D3300 D5600 D5500 D5300 D850 D780 D750 D7500 D7200 Z6 Z7 Z50-2.4GHz I-TTL Speedlight for Mirrorless and
Nikon releases weird flash triggers that hang off the side of your camera and they're "only" $200 - DIY Photography
Amazon.com : Godox Camera Flash Trigger Xpro-N for Nikon Wireless Remote 2.4GHz 1/8000s HSS TTL-Convert-Manual Large Screen Design Customizable Functions : Electronics
US Godox V1-N TTL HSS Speedlite Flash+X1T-N Trigger Umbrella Softbox For Nikon | eBay
Amazon.com : Neewer 16 Channels Wireless Radio Flash Speedlite Studio Trigger Set with Standard Hot Shoe, Including Transmitter and Receiver, Fit for Canon Nikon Pentax Olympus Panasonic DSLR Cameras (CT-16) : Electronics
Amazon.com : Godox Camera Flash Trigger Xpro-N for Nikon Wireless Remote 2.4GHz 1/8000s HSS TTL-Convert-Manual Large Screen Design Customizable Functions : Electronics
Neewer Q-N TTL Wireless Flash Trigger Compatible with Nikon DSLR Camera | eBay