I am already at level 5 and so far I have encountered only one. I obviously don't have the Alchemist tree so I won't be able to craft one to save my life. Right now I have like 20 each of Iron and Steel Ingots and am planning to create a couple of the Royal Beatdowns and some Rings of Iron Thorns.
I was thinking of increasing my chances via the RotDG's Vendor Machine room in which you can create a Vendor Machine for yourself. I usually go Growth, Pillar, and Scrutiny to produce a Crafting Vendor. I guess my question is, should I be going with the drink vendor? Or some other Vendor? And is there ANY other way to obtain it?