This is the sort of thing to make me bang my head on a table. As Maxwell wrote yesterday, the pricing table is based on building blocks. If I want to determine a price for gin, say, I can look up a recipe for gin, determine what's in it, gather those things together and compare them against a ratio for gin making and boom, I have a price for gin.
However . . .
Since I'm using details of the real world, I am forever finding these odd, unusual substances in the pages of an encyclopedia, things I would never, ever think to add. Today's example is a liqueur I've never actually tasted, Grand Chartreuse (or simply Chartreuse). I have this reference from Tarragona in Spain (though it should be Voiron, France - I have no idea why the detail is included this way in the encyclopedia, but I'm going with it). This is the only reference to the distilled beverage. Naturally, this means that if we're not actually adventuring in Spain, this stuff is going to be expensive.
Unfortunately, for my pricing table, it is a little difficult to gather the ingredients together to make the product because only two people in the world know those ingredients!
I can just see me writing to the monks: "Please, sirs, I have no intention of making your product, but I have this table-top role-playing pricing system that needs . . ."
I'll just jury-rig something, probably using saffron as a central herb, making the stuff really, really expensive. If someone wants to write to tell me what Chartreuse tastes like, and make suggestions about ingredients, I'd appreciate that. In the meantime, consider the same sort of restriction applied to people in your world that make, oh, magical rods and staves.
I thought some might find the linked page interesting.
Oh, here it is:
"After 1904, when the Chartreuse trademark belonged to "Compagnie Fermière de la Grande Chartreuse”, the liqueur made by the monks in Tarragona nicknamed “Une Tarragone.”
I will probably fix my source table (the name I call my table that places references), moving the liqueur to Vauvert, France, where it started.