It's also listed on ksl.com, and has been for many months:
https://www.ksl.com/classifieds/listing/39110993
My recollection is the seller originally listed it at the bargain price of $49.5K, and obviously that didn't fly.
While he describes it as "Tracks and Base are a Tucker 442 Chassis with wide powder track conversion", In my opinion that is somewhat misleading. Yes, it started as a Tucker 442, but we all know those models were steel-tracked pontoon Tuckers.
This has a non-Tucker made setup with different carriers, idler wheels, spindles, rubber belts and grousers. I don't think there is anything Tucker supplied in that system. If you need parts I think you'd be on your own.