As for RCS's inventory - yes they are selling very well. I will do all that I can to get them more asap but ordering the custom made cables from Korea takes 2+ weeks so I doubt that I can get them out much faster than 3 weeks and I have no inventory left at the moment.

As for the glow plug driver question - No - 2.0 Volts is is the limit. The device supports a battery for each plug or one battery for both plugs. One good nicad or niMh battery will last a long time.