> ... I commonly see the panels for the Moog Source for
> sale on eBay, but never for the Polaris...

The same fella/company (chipforbrains/technologytransplant) also has panels
for the Sequential
Prophet-600, and I'd have to guestimate that the number of Polarii around
would be on-par with something like that. (I've ever really seen a shortage
of the Polaris keyboards - the don't match the quantities of something like
the Yamaha DX-7, but you always seem to be able to find one, if needed).

I'm a little surprised that with the huge number of companies that will make
custom membrane switch panels that no one has decided to try to make one for
the Polaris (if even only for their own personal use) (sure, some of these
can do fancy things - like have built-in LEDs which will be very expensive
or be waterproof to 10 atmospheres - but others do what are essentially
plain-jane panels).