Propellers known as "Props" are always good to have as extras, It is like a spare wheel. It is good to keep spares when you need it on the most unpredicatable time!
DJI Mavic PRO Propellers Quick Release 2 Pair...R425.00
Propeller For DJI Inspire - Carbon Fibre - 2 ...R695.00
Propeller for DJI Phantom 3 - 9450 - 4 Pairs ...R545.00
Propeller for DJI Phantom Quadcopter FPV- 944...R299.00