I can’t find it either. What you do is get some ethanol 90% or better. Bacardi 151 works too. I can’t buy it in my state so I order it online.
You dry the product as much as possible, grind it up pretty good and fill a mason jar. Throw it in the freezer. Put the alcohol in the freezer too, leave them both overnight.
Then pour the alcohol into the product to cover. Shake well, and throw it back in the freezer. Every hour or so, shake it and put it back.
After a few hours, strain the liquid out, put in top of a double boiler and boil it down. It’s really that simple.
You can do two passes to get the most out of your bud.