You don't need to open an account. You can go to one of the post offices in China to send them to USA.

If you have a large amount in each month, you can call China Post service number 11185 (then 8 for English service) to ask how to cooperate with them and enjoy a cheaper price. Also, you can try to find a reliable delivery agent to cooperate to deliver them for you.

I am an importer located in the USA, and need an account for the agents can charge the shipping to me directly. Can I have an account and make payment w/credit card or e-check