There are some J90's out there, but they are usually in price ranges that make them hard to justify, which is more than likely why they probably never seem to sell, at least on the collector market.
I assume at this point it's all museum stuff. Adlib gold card for $3200, Apple 1's in the stratosphere (Steve Jobs worship.) There isn't that much practical use for any of it outside of history. But scareness and specultive mania drives demand I suppose.
I suppose if you had a company that needed one for an important piece of software they had to run, you could probably get a good price for it. I made a good deal on an 4D/80 I had like that once. Some company in Germany had code that was hand coded for the GTX GPU with a lots of R3000 assembly, it would not run on anything but a 80 or 70 with a GTX card set, and the work to move it was more expensive than keeping the older systems alive. Might be different now.
I would think any application with that much demand has been ported or re-written by now.