I got it here
There was a refurbished one I got very cheaply (making it easier to trial).
There's a "newer model" that is flicker free but doesn't specify whether 8 bit or 6 bit.
If you want to try the new one, I would suggest contacting them and asking them.
I'm using this monitor along with a nvidia card on linux, all of which has allowed me eliminated the usage of dithering. So it was not this monitor alone that "made everything better" is regards to dithering.