You'll want to get the Evolv Kick 2 and not the clone or the original. I bought mine at RTD vapor, but they are out of stock. The Kick to is adjustable up to 15 watts, accepts build from .5-3.3 ohms has two grounding post that eliminates the misfire issue that were common in the original kick and clones, and has better power management.
Most places seem to be sold out right now but found one
HERE . If you do a search on Evolv Kick 2 one should find more sources, but they sell for $45 pretty much everywhere.