It's country of origin that determines the tariff. So, if parts and drones are made in China, but make trip through Canada, they will still be tariffed at China's rate. What rate is that? Well, it depends how trump feels that day. Nothing to...
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/