Well if your going the the zero nicotine route then that's much easier. You can get 1 litre of VG or PG on Gmarket for ~ 5,000-6,000 won. The problem with Korean liquids is you just don't know what they are using for flavouring (see diketones). Not to mention most Korean liquids just don't taste very good. As mentioned previously, go to Ecigexpress and order about 7-8 different flavours (~$50 including shipping) via USPS. Then you can get your costs down to pennies a ml. And you can create your own liquids to your liking.