It should be fairly cheap.
front diff $40+/-
cv's $40 each (BapGeon)
I think the spindles are the same
Locking hubs $50-$100
front Drive shaft $50-$100
Rear Driveshaft
Transmission/transfercase - should be able to find a cheap transfercase for automatic since most people toss them out when they go to gear driven transfercases.
Also there is plenty of 4runners out there that sell for around $500 because of the 3.0 issues.