Customs brokers help individuals and businesses meet government regulations for importing and exporting. They do this by preparing documentation, calculating duties and other charges, and acting as a go-between between the importer and Customs. Because of the highly complex and sensitive nature of importing and exporting, Customs brokers have to pass examinations and become licensed before they can practice.
The cost of using a customs broker depends on the complexity of the import and the size of the shipment. Quite often, it is useful to use a Customs broker, at least for your first import. From there, you can usually learn enough from them to complete future orders yourself.