You are right Concat. I ordered a bunch of liquid from China one of them is 30ml, 99.9% Nicotine level. It's lethal, but somewhat excited when I ordering it. Unfortunately Canadian Customs ceased my shipment last month. I contact the office but the shipment still under "investigation", which has to wait for another 30 days before it is confirm how to handle my package.
In Canada and U.S. I don't think they carry any nicotine over 60mg nicotine level.
You can get 100mg, but even that is very high. I think it's pretty absurd to even order 99.9% nicotine (which is essentialy 1000mg/mL)... especially when you are new to DIY. One single drop would contain like 50 mg, which is about the lethal dose. It should be noted that nicotine absorbs very quickly into the skin. You spill that bottle on yourself... and it's not "oops," it's "tell my mother I love her and delete my internet browser history."
Just be safe and and don't think so much with your wallet.