At first glance, there seem to be a few $500 units out there of dubious origin. The guys in the screenshot below seem to have paid Google as they come up first with various search criteria. I'm not really considering them at the moment, but highlighted a couple of semi-interesting facets of their 'offer'. No core charge either I believe. Just a pretty expensive junkyard tranny that has been washed off and 'inspected' and blind faith that it is from a 72k vehicle. For all I know they are a notorious ripoff - just throwing it out there...
edit - for 'labor' they claim they will pay 'my' shop to R and R the transmission if it fails during warranty. I expected to see a clause about off-roading voiding the warranty, but they only seem to exclude racing. Again, I am not saying this is any kind of deal - just some food for thought and critique!
If I do have to buy something like this one day, I'd rather the seller took PayPal Credit or Affirm for interest-free spread out of cost. Broke AF ATM.
Also, if anyone in the Bay Area has the terrible misfortune of having to total their rig for insurance purposes and the drivetrain wasn't compressed, I'd be interested....