The guy i'm getting it from is a rebuilder (insurance cars). I bought my last car there and never had a problem with it. But he happens to have a '99 Limited that has the E-Locker option and didn't even know what it was or why I would want it. The '99 has serious side damage and is beyond repair so I got to mix and match a little for a little extra. Getting the axle installed for $300, The leather seats installed for another $300.
After doing a bit of reading, I'll have to make sure my F/R gears are the same (maybe have to get the front gearset too), and that I should get the springs for another 1" lift. Oh, and I have to be sure to get the computer that runs the rear locker or will have to make a "switch" for it.
That's the only Locker he has on the lot. Sorry
I've done searches for rebuildible cars before and have found many toyotas available though, but whole trucks, not just axles.
Here's a neat place to check out
http://www.bid-icap.com/cgi-bin/SearchInventory.cgi
you have to pay a yearly fee to purchase these here or at most insurance auctions ($500 here), but some businesses sale these publicaly at higher costs though... like this place
http://www.ecoastauto.com/