Bongo International (Bongous) charge $5 per shipment that you send to them from a retailer for forwarding on to yourself. They have addresses in the USA, Europe (EU) and, differently to most other forwarders, S. America. They claim to ship around the world, but it is difficult to see exactly what their fees are, although there is no signing up or monthly fee. They offer insurance and personal shopper service to pay for any shopping you are unable to.
BongoUS ceased trading?
It appears that the package forwarder Bongo are not trading any more. If you are looking for other package forwarders, this link will allow you to compare many of the most popular services from the USA.