On my color palettes, I list the color and the company I get it from. Here are the links to those companies:
https://www.dharmatrading.com/
https://prochemicalanddye.com/
https://www.grateful-dyes.com/
The colors I used from Happy Cat are currently unavailable, and now that the website is completely removed, I'm unsure if that business will ever start back up 😕
I have a TON of colors and use a lot, but if there's a color in my palette you don't have, just use one you do have that's close enough. Many of the palettes I have were created from adapting inspo color palettes to the dyes in my inventory that I felt would be a close match. Don't worry about having every color ever made because it will still be beautiful. Personally, I just have an obsession with trying to collect every color possible but honestly, there are plenty that are so similar that you really can't tell enough of a difference to matter.
Also, I do use a lot of Dharma Special Order colors. So if you don't see it on Dharma's procion dyes, it's probably a special order color. Again, you can just use another color that's a close match. However, if you want a special order color without having to buy 5 pounds of it, message me and I will give you the contact info of the lady I buy mine from. She sells them in smaller quantities so that it's more sensible for those of us who don't need (or can't afford lol) 5 pounds of one color 😅
Feel free to leave me a comment if there are any questions you have that I haven't covered!