[3dem] update for Nikon 9000 scanners

[Esther Bullitt]

Hi,

It turns out that the Nikon 9000 scanner is not officially discontinued,
so you can still order one at, for example, amazon.com, with an expected
delivery time of about 2 months. 

In the end, my collaborator bought a used one.

Lastly, no one sent any information about a substitute in the same price
range, so for now getting a 9000 is still the best bet.

-Esther