I have searched Novigrad, Velen, White Orchard , Shelige and now Coussaint for a herbalist that sells
Rebis, Erynia eye, and Vermilion but they all seem to sell the same, Nothing anywhere.
Any suggestions? (excuse the spelling)

You get Erynia Eyes as drops from... Erynias. Lots on Undvik, Skellige.

Rebis and Vermilion you craft yourself. Go to any good herbalist for any missing ingredients. You can get the formulas from Gremist on Ard Skellig.

Thank you. This will help.

All videos and sites I have checked for rebis and vermillion foruma leads to that master alchemist in Skellige but he has never had whenever I have seen him. Some people state that he has all formulas but this is not true. I have been to all alchemists and herbalists in the game and am yet to find these items.

As for Erynia eyes, the caves in Undvik had two Erynias but nothing to loot.
Someone said north west Velen, east of lighthouse. A flock of birds there but the horn and aard brought none down.
Someone said Skellige, north of Redgill marker, and there I finally got myself two eyes.

He definitely does have them -- I had already found Vermillion. See attached.

You usually craft them yourself (with the exception of Erynia eyes of course) the only alchemist that sell them as far as I know is the one in Beauclair.

...you have "white seagall" since produced?

because you craft Rebis normally yourself but you need therefore "white seagall"

I need for Rebis "white seagull" (for white seagull you need Alraunenliqueur and Cherryliqueur -> you can buy in Taverna), Verbena, ergot, allspice, misteltoe, Ranogrin

Have you made the Quest for Gremist? Were you his "apprentice"?

fore Hickory`s right! The recipe for Rebis ect you can buy Gremist.

(I hope google translated correctly)

I have just tried Gremist again. He had 24 Runestones diagrams and two signs diagrams.
Also Superior manuscript pages for Maribor Forest, Petris Philter and Black Blood.
No rebis or vermillion.
Last year I did do quests for him as his apprentice.

UPDATE: I bought rebis and vermillion from a vendor in Toussaint. No need for manuscripts.