The BladeForums.com 2024 Traditional Knife is available! Price is $250 ea (shipped within CONUS).
Order here: https://www.bladeforums.com/help/2024-traditional/
I don't know about Lansky brand stuff, but diamonds are not necessary for sharpening. Ceramics, natural/artificial stones, chromium oxide compound, leather strops all work great. Like anything, Diamond sharpening stones and compounds have their advantages and disadvantages. Diamonds do tend to wear less, remain flat, and cut quicker than other means of sharpening, but tend to be more expensive.