Anyone knows a less expensive shipping method from US to NZ?

I've just tried to place my 1st couple of orders from wholesalers in the US & was shocked to find how expensive the shipping is. Both these wholesalers use USPS. Does anyone know of a reliable but less expensive method of shipping from US to NZ?

Cheers, Wendy

USPS is usually the cheapest option for shipping from the States. If you know the dimensions and weight of the package, you could do your own research and find out whether the supplier is charging a reasonable shipping cost, or is hiking up the shipping price to improve their margins.