Well...if you really want some there is 36mg and 0mg available. All you would need to do is buy a couple bottles of 0mg and 1 bottle of 36mg. You could mix up your own batch at 30/70 and get around 11mg.
I am no good at math, so someone else could probably give you a better idea of the exact ratios. I got that number from a quick and dirty calculator search.