I was putting off stocking up on nicotine. Not any more. I'm up for a deal on some good pure nic base. I can DIY but feel pretty sorry for those who can't.
Mixing your own juice is super simple. Since most juices come in 6mg increments (0mg, 6mg, 12mg, etc.), and 6mg is too much for me to drip, I would buy 2 bottles - one of 6mg and one of 0mg, and mix them to get 3mg. But, even 3mg became too much for dripping, so I got 0mg juice and 50ml of 100mg nicotine base (70VG/30PG) from Nude Nicotine and mixed my own 2mg.
I highly recommend getting this free juice calculator. I compared it to at least 20 online calculators to ensure accuracy. I have a dropper bottle (previously used for medicine) that has markings up to 1ml. They say "on average" there are 20-25 drops/ml, but I counted 26 drops from mine, so I entered 26 into this calculator (extra nice it allows you to do this).
I also used a micrometer to measure what the vape shop sold as an 18ml bottle, did the math, and confirmed it's really 18ml. Maybe a bit extreme, especially considering the low mg's, but it's true to my nature.
So, 9 drops of 100mg base into an 18ml bottle of 0mg = 2mg strength.
eJuice Me Up - Best eJuice Calculator