The BladeForums.com 2024 Traditional Knife is available! Price is $250 ea (shipped within CONUS).
Order here: https://www.bladeforums.com/help/2024-traditional/
These guys make a black oxide coating kit. They make one for carbon steels and another for stainless. They say it produces a corrosion resistant finish. It should be more durable than any paint system. I have to say that I have not tried it. I ran across it at work when I was looking for other information. But it looks like it will do the job and the setup is suitable for DIY.
http://www.caswellplating.com/kits/black.htm