Ehpro atomic or Trident v2 for flavor and decent clouds. (Ebay, Eciggity, 101vapes, etc)...all trusted and true vendors in the USA
If you're really good builder and want "Omega" clouds, check out Hcigar Omega.
There are newer RDAs clones like the Stillaire, and Toby that are out in the states, mostly E-bay...but I haven't tried them...but the reviews on the authentic are pretty good.