(unsolicited opinion
) Bad idea right now.
I suggest you learn more about the product and the major players/manufacturers in China before even considering this for your company. A Customs seizure could cause major problems for your firm's importing business. Besides that, I know several companies that got burned badly by poor manufacturing and poor products when trying to enter into the market and buy direct from China because they didn't really know anything about e-cigs. They lost tens of thousands in useless product.
Small personal orders from China (for the most part) are still not a problem. With Wholesale purchases from there, you hold the risk of losing the entire shipment. Many of the China sellers will replace a small personal purchase if it is seized (check their websites for details to make sure).
Best way to "get around" is to decide what e-cig is really working for you and get some good
vaping experience in first. The best is to look at
reviews on the forum and see what is being sold by Stateside suppliers. In the mean time, order from reputable suppliers on this forum to stock up as much as you can. Look for sales and coupon codes to save money.
That said - To answer your inquiry: Well known current manufacturers and a few examples of their more popular Model numbered product are:
Sailebao (marked SLB on their product) = DSE series (DSE 801, DSE 901, DSE 510, 905 battery unit)
Joye = Joye series (510, 302, 306, Ego, Janty Stick)
Kanger = KR series (KR808D, KR708)
First Union = RN series (RN4072 (penstyle 801 compatible), RN4075 (901 compatible), RN4081)
Smoore = M Series (M401, M402, M403, M702, M201.)
Dekang/Boge = E-liquid
Happy
vaping 
and good luck!
