NN sells nic base from 3mg/mL to 100mg/mL in 100% VG or PG, 50/50, 70/30, and 30/70 as well as a couple of extended life versions with all the same choices at attractive prices... some in up to 500mL/some in up to 1 liter bottles listed, but if you contact Jake direct the skies probably the only limit. As for their fairly short line of flavor's, they are all concentrates extracted in house with VG and ethyl alcohol (PG free) that you mix in VG, PG or nic base at whatever percentage you want, can build your custom recipes from using any other additives you chose same as with the flavors from any other source.