OK, so I just spent the last 30 min. looking at this site that DonDaBoom had posted in another thread. e-Cigarette modifications | e-Savuke.com It looks like it covers just about every big batt mod out there. Your husband can get anything from a pipe bomb to a doubble barrel shotgun. Surely he can find something to his liking from there.
Nice site, thanks for the link optsmk.