Well here is a map of some ecig stores, click on the area to look at.
Not everyone on the map is ECFregistered, just keep that in mind:
VaporSearchUSA
Bookmark it, the map keeps getting populated.
As far as online, some stores do have great prices and little or no shipping,
but I still enjoy shopping at my local stores. They eliminate all the waiting for the mail, and I can test flavors, and see live demos. If I need a part or more juice, it's nice to go to the store where it's actually waiting for me to get there, not the other way around.
I still order online. I support both, but most of the gazillion smokers do not bother getting internet access when they can purchase and solve their needs in 15 minutes flat from a walk-in store.