anybody know where I can get cartridges compatible with Green Nicotine brand E-Cigs? the cartridges they sell are expensive and they want to avoid marketing to kids so they don't sell flavor cartridges and getting Nicotine-Free from them is a pain in the .... I need good, cheap Non-Nicotine ones that work with it. I don't need liquid, as these are so hard to open its not even funny, just cheaper carts with more options.