Andrew, sorry mate, but you really need to take into consideration that this is German Engineering, quality 7075 alloy parts are going to be expensive... as opposed to the Chinese cheese alloy bits.
The centre diff gear that i received from Loew Racing Parts were a perfect direct fit onto my RR5 chassis and driveline.... unlike that cheaper stuff that i have used during my RRV4 days, have had to file and recountersink/redrill holes just to make them fit