Ocean freight is around $2-$5/kg, and a China-US shipment will take around 30-40 days or more. At about $5-8 per kilo, a China-US shipment between 150 kg and 500 kg can economically go air freight and will take around 8-10 days.
Do I need a customs agent to import?
There is no legal requirement for you to hire a Customs Broker to clear your goods. However, many importers opt to do so for the convenience. Customs Brokers are licensed by U.S. Customs and Border Protection (CBP) to conduct CBP business on behalf of importers.