Outer Limits 4x4 Board

what models came with the factory locker, are they easy to come buy at wrecking yards, and what would you expect to pay for a used one

You'd probably only get one as a whole axle so unless you've got drum brakes and want to upgrade an airlocker is probably the way to go.

you need some wiring and plumbing for it too.

thought it might be a cheap way to pick up a locker but from what im hearing they are hard to come by, might have to just get an airlocker, ive got 2 in my lux and they are great, im new to modifying nissans and just thought this might be a cheaper option, guess it still might be if i can find someone thats wrecking one in their backyard and doesnt know what its worth

You might get the whole diff for like $600 or so... but need the other bits.