Always check shipping costs prior to entering your credit card information. Many online stores are not located in the United States.

Is there a physical store that you can call to ask questions to? Can you call them to check on your order?

Some companies are not located in the country from which you are purchasing your electronic cigarette, is your order inadvertently going through Customs?

Make sure the company you are purchasing your electronic cigarette from carries parts for the electronic cigarette they sell. Do they service their product?

Are they selling you just refill cartridges for your electronic cigarette? Bottles of E-liquid are much more cost effective.