New Continuous US Customs Bond. This reusable type electronic customs bond is highly recommended for high volume imports. Also known as the continuous customs bond, this customs bond is cost effective when it comes to high volume importing. The minimum allowed by US Customs is $50,000.00 USD. It is generally purchased once and then renews each year. A single transaction customs bond can be purchased for each import, however as the number of import shipments increase, the cost effectiveness of using of the continuous customs bond becomes apparent.