As part of a recent release, the number of recipes that can be bought from Basil was limited to one copy per player per terminal.
While I can almost understand the desire for a vague limit, I'd like to make a few points in hopes of convincing interested parties that one copy per player is far too low a limit. The short version: please either abolish vendor purchase limits, or raise them to a more realistic cap of 3-4 copies per player. Giving vendors larger inventories would also help: I've seen some vendors that sell only 7-8 recipes at a time, while others sell 22.