Back in 1605, the Carthusian Monks of Chartreuse were given a manuscript with the recipe for the Élixir Végétal they still make to this day. To celebrate...
Green Chartreuse has been nearly impossible to find the last few years in Oregon, though I did find a bottle through sheer dumb luck. But now I'm afraid to use it lest I run out, which is an absurd condition. If only the Carthusian Monks could increase their production capacity just a wee bit.
They have actually decreased production which is why it is hard to find. I can get both yellow and green but the price is up about 80% (I am in San Diego, CA). There is an allocation and each store only gets a few bottles per month. My suggestion is to ask your liquor store if they can order a bottle for you and call you when it gets in but you may have sticker shock. I have seen pricing for 750ml bottles anywhere from $79 to $109. I now use my sparing. Good luck.