I'd have the 510 disposables available to try:
MadVapes LLC
Might have to have a usb wall plug available for those not around a computer.....
... and then the Joye 510 starter kit, for a follow up.
Explain to the customer that the parts in the disposable are compatible with the Joye 510 kit parts. The "disposable battery" is likely just a regular auto battery, but it may have a cutoff time in a chip, yet some have reported over 30 chargers with it, I've gotten 15 so far and going strong.
And while they are larger than a cig (although close to a 100 at 112mm), they are the ones that many end up with... and this factor would go far toward not feeling ripped off as is the case with many supermini's or ones that 'look more like a cigarette'. There are a multitude of threads here that validate that fact. The 510
performs more like a cigarette and that is what most people are looking for.
http://www.e-cigarette-forum.com/fo...reviews/13928-primary-device-preferences.html