Pracas,
I think you just have to list the contents on a special form which you can get from the post office. A company from Hong Kong shipped to me and they only put one of the products down on the form; they didn't list all of the products. I'm amazed they get a signature requested from Hong Kong and shipping is very cheap unless I want it DHL or Federal Express which I never request.
I think I have to pay tax if it is over a certain amount.
If you asked at the post office, I'm sure it would only take five minutes of your time and it might be worth it to you in the future. I might even order from you in the future and I can even advertise your products to my friends.
Chuck