Don’t think you can now.
The niche was totally different at the time and imo very competitively priced.
Now if you want a good 64mm you’re over a grand for a zerno or lagom p64
If you want bigger burrs that gets even crazier.
I personally don’t like the rate the 64mm grinders are getting pushed out. Ten a penny comes to mind, and most are fugly
Only one I quite like is the df64v, but they stall app.