Be patient, they still do and will come up for sale.
Both originals and the Rottendog remakes.
Just be ready to pay when you do, the replacement has jumped cost from $295 to $500-600.
For people that are not aware the reason they are hard to find is they have obsolete electronic parts that no longer exist commercially, and was part of the reason Rottendog stopped making them several years ago.
This is one PCB hobbyists should NOT attempt to repair for themselves, unless they have the necessary experience and tools.