There are even some sites which offers their services for 100 % free. Tip #4- You should at least hire an agency or broker if if you are able to travel China you and your family. Well that's a very easy one. a margin is what's left after all expenses are paid after selling some thing. https://is201.gaskination.com/question/which-product-can-deliver-bigger-profit-margin-discover-with-salehoo/