Yes, Starkman has them.
So a locker locks the axles together solidly. Truetracs are helical geared limited slips (no clutch plates to wear out).
A locker needs wiring (if an electrical locker) or an air line and a compressor (if an air locker). There are some mechanical lockers, but their street manners aren’t my thing so I don’t recommend those. A Truetrac is completely self contained.
A Truetrac on the street is pretty invisible. Turning a tight corner and getting heavy on the throttle I can spin the tires, but otherwise never notice them. On the trail (in my Explorer), I just point it in a direction and as long as I have the clearance, it seems to get there. No switches to flip, it just goes.
The trade off is if you lift a tire in the air, you have to fool the Truetracs by applying some brake with your left foot as you gas with the right. A locker doesn’t care if a tire is in the air.