On TLP (as of classic on Yelinak) you can buy this from Ilrion Schaecius in East Freeport on the docks at 118, -910, and from Ennrion Striesius standing right near him. He is not available in the find window, but he is there, and has this pattern for sale.
Edited, Jul 5th 2022 11:16am by Xanfi