https://http.kali.org/kali/pool/non-free/b/broadcom-sta/
Download the latest broadcom-sta-dkms_XXXXXXXXXXXXXXX_all.deb
from the link above
For example:
$ wget http://http.kali.org/kali/pool/non-free/b/broadcom-sta/broadcom-sta-dkms_6.30.223.271-24_all.deb