I forgot about the warranty.  Cignot gives you 30 days on the atomizer, 60 days on the batteries.  My atomizer died on day 13.  I e-mailed Vicki, and she's sending a new atomizer no questions asked.  So, lowest cost is a subjective question.  If you get the lowest price kit you can find, but with no warranty, it may wind up not being as low cost as you think.