Bought a number of them from Aurora, in NOS condition, for $175.
Then bought a few more from NVDevices when they were liquidating them for $100.
Prior that that, early 2000's it was all by scavenging whole units.
Think it's time to have these updated and remade.
Yeah, I bought three for $110 each from NV Depot (now NV Devices).
The thing is, probably the most demand for these is right here in the amateur astronomy community. The most popular C mount housings are the Micro and the Mod 3 C, and my guess is that the vast majority of Mod 3 Cs have been sold to the people right here on CN.
I just don't know how many someone would need in an order to produce another batch.
My bet is that just as with this case, there are other small lots of these lenses about. Not everyone knows that these lenses are in demand, and because of this, the may not see the incentive to find them in their inventory.
Edited by Eddgie, 22 August 2019 - 11:19 AM.