Here is the list of U.S. Suppliers. I will update it as I can:

Be sure to check out the Coupon Code page for deals and discounts.

CigTechs.com Good range of products, so far good to deal with. 

ElectronicCigaretteSales.com Out of Illinois. Good juice selection. Haven't reviewed their e-cigs yet. 

E-SmokeyTreats.com Based out of California as well. Good products and service. 

ePuffer.com Based out of Canada. Seller of the "Magnum" Disposable atomizer e-cig.

eCigMall.com Based out of California. Has an assortment of e-cigs. (a few people have been reporting issues with this company. Just be forewarned.)

Janty.us The U.S. distributer for Janty. Service has been good and the Classic is a beast.

MyECig.com Based out of Phoenix, AZ. So far good products and great service. (might not be selling right now)

PureSmoker.com Out of Tennessee. Never used their new products though 

SmokeStik.com Out of Canada. They offer the Super mini and accessories.