Blu would prefer you just shell out five dollars every time one of their electronic cigarette tanks runs out of e-juice. Here’s a relatively simple and inexpensive way to refill (and re-seal)) the new Blu tank system yourself with any flavor e-juice you desire. The heating coil in the tank (atomizer) is not replaceable so there is a limit to how many times you’ll be able to reuse it before it fails, but I’ve refilled mine a couple times already with no problems.
Enjoy.