This Fotasy Nikon F to Z mount adapter is the cheapest alternative to the original $250 Nikon FTZ version and it costs only $16.29. The adapter has no electrical contacts and is compatible with all Nikon Z mirrorless cameras:
More Nikon F-mount to Z-mount lens adapters can be found here:
The new Viltrox AF 13mm f/1.4 STM lens for Nikon Z-mount reached its funding goal on Indiegogo