Refilling Smokestik cartos?

[4magirls]

I have a white smokestik and I know from the massive reading I've done on this site that it is a RN4081. Ok....but where can I order more cartos? A friend showed me how to refill the ones I have but I know that they won't last forever. Also, I am having a hard time finding a good US based e-liquid seller that carries what I am looking for. (12mg Vanilla Latte or coffee flavored) I am just confused by all of this filling and ordering! Help me please!