306 cartos fit the blu. They are hard to find though. Make sure to get the standard resistance (2.5+). The low res will kill your blu batts. And beware that the 306 cartos at litecigusa are 2.0 ohm, so dont buy those.
The Volcano cartos will work. I used them for a while on blu batts. I found that the volcano cartos were inconsistent, in that some I could refill 7 to 10 times, and some only once or twice before they stopped working well. Also the mouthpiece caps are hard plastic and break easily when trying to remove them for filling. The Boge cartos linked above have soft rubber caps, and Boge is a well liked brand for cartos.
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