buy liquid and cartomizers from one of the many sites out there. I go to aquavapor cig for most everything. Liquid i tend to wander from site to site. some have flavors i like that the others dont. But seriously just refill cartomizers, dont buy prefilled unless you need to replace the cartomizers, which should in all reality last over 2 months without any issues. ive been smoking on this 5 pack of cartomizers and refilling them for about 3 months now and they still work beautifully.
as for flavors, i am a big big fan of "black
tobacco" from aquavaporcig