If you humanly kill them you can get $10 per fox you kill. https://agriculture.vic.gov.au/biosecurity/pest-animals/victorian-fox-and-wild-dog-bounty
These links might also be helpful
https://pestsmart.org.au/toolkit-resource/code-of-practice-fox/...
Just be careful what you do since it is quite strict about how you can trap/kill/handle foxes and other animals in Australia. If you are caught miss handling them you can face a hefty fine. Luckily unlike most predators foxes aren’t as strict, but you should still be careful.