E-liquid is the liquid substance that is vaporized in an electronic cigarette. Many e-cigarette kits come with already filled cartridges or cartomizers while others have the ability to fill your own. Refilling cartridges with a bottle of e-liquid is much cheaper although it is not as convenient as buying pre-filled cartridges. There are also generally more flavors available in bottled e-liquid form.

Below are links to some of the best e-liquid available:

V2 Cigs - New V2 Platinum-E-Liquid-Flavors: Mint Tea and Congress!

30ml DragonJuice - USA Made - (18mg) Medium

Halo Freedom Juice eJuice

E-Liquid From Vapor 4 Life