I just got a front Truetrac from the USA with both carrier bearings fitted and delivered to my door for ASU$755:D
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The other thing to consider is that if you get ANY fully locking diff (not TrueTrac) you will be replacing your axels with heavy duty ones, ether when you fit you lock or after you have broken an axel in the bush.
So, air lockers you can add $800 for heavy duty rear and for the front, a lot more than that. :eek:
Im ordering mine (Detroit) from Keith @ Rovertracks too... however, ill also be getting his axles... all up around $1500AUD delivered to my door.
Because cross slopes and backing up hills can be downright painful with a detroit;)
The longer I've had lockers the less I actually use them, you learn how often they are needed and how they can be a pain if you drive locked all the time........not that I'd never be without locking diff's:D