I have seen the replacement tubes for sale at gotvapes. I don't think they are very expensive. I am using their clearomizers now and I'm really liking them. I will buy replacement tubes from them when mine start to crack. I still look at it like this, I was spending 10 bucks a day for smokes so if one cartomizer last me for a week and I'm paying less than 2.00 a piece for them I'm saving 68.00 a week. I like those savings lol.