Check Wizard Labs or High Desert Vapes for good prices on unflavored nicotine. The only issue buying from HDV is they only offer 60mg for DIY, I think Wizard has lower concentrations, and if you get stuck there as well, I know Mt. Baker has 6-36mg in fairly large bottles, but unfortunately they're a little expensive.
Yeah, HDV only does 60 and that's kinda high. I forget where you get into "risky" territory. I'm still a beginner in DIY so Ima stayin' down in the 12 to 24 range for now.
And their website says theirs is Wizard Labs anyway. And Wizard goes down to 12 (and up into very scary territory I just noticed!).
Wow, though, Wizard prices are good. I got a liter's worth for about the same price as MBV's 236ml bottles. Have to mix VG in to get my 50/50 but for that kinda savings, absolutely yes I'll mix it myownself!