Currently, for commercial ops, the FAA requires a unique RID module for each aircraft that needs one. Not the 1 module for all aircraft like with recreational. Supposedly they are considering changing this, but as of now, that's the way it is...
There are some used ones on Ebay. I have brand new, sealed with 2 year care refresh policy if you're interested in new.
https://mavicpilots.com/threads/mavic-3-thermal-brand-new-sealed-2-yr-care-refresh.152754/