I've been considering buying one and the vape pen is free when you buy any 2 cartridges. The only problem is that hardly any shops in my area sell the cartridges, so I was wondering if there's a way to refill it yourself. I saw this YouTube video where a guy was reviewing it and he said that you can refill the disposable cartridges with pure gold, but no shops in my area sell that. He also had another mouthpiece that worked with it that you can put your own wax and shatter in, completely removing the need for the cartridges. But I've been looking everywhere and can't find that mouthpiece, does anyone know where I could find this mouthpiece or a similar one that would work with it? http://youtu.be/_NRYrjbwy4U
the o pen looks like a standard 510 model of e cigarettes with a three piece cartridge/atomizer. nothing special. this thread may help answer your questions more about what to put in the pens. http://forum.grasscity.com/vaporizers/702027-e-cigarettes-how-canna.html
You can get cheap replacement o.pen parts from incredipen. Also can fill pure gold in clean and empty incredipen vaporizer cartridges. I love the o.pen's they rock.. but cant find them anywhere.