You can buy these at NFTkey and Paintswap

You can burn them here on the Bunker Site, or using any burn function on NFTkey, paintswap or just sending to the dead wallet yourself.

When you burn 2 FTM-Zombies you can mint 1 ETH-Zombie at the end of the current burn period. Check the timer on top of this page to see when this period ends.

https://mint.thebunkerstudios.com/

If you mint after burning FTM-Zombies your mint will be FREE (only gas ofc). Public mint price will be updated by the community every period.