Outer Limits 4x4 Board

Where is the best place in W.A. to get
Mitsy parts????
I`m after parts for my gearbox its a
98 express 4x4 only done a 115000 ks
& its crapped it self. Have`nt even cained it.
Any advise would be great,
thanks Jeff

Trtader parts mags advertise brand new boxes at $1250-1550-
May be cheaper than fixing old box if its more than bearings needed.
Also less time to instal.