Does anyone know a good, cheap shipper of goods from NZ to UK?

I am Googling through the people who advertise shipping student gear and household contents but have't found anyone cheaper than the Post Office to ship a 3.5Kg package.

The package is a windbreak from Katmandu - a nice one which is not available in the UK and is at half price in the sales.

It would cost about $75 to buy and another $75 to ship and we don't really want to pay $150 for it to have it in the UK.

Waiting on some replies, but I am getting the feeling that these shippers expect to shift a lot more than 3.5Kg and their minimum charge may be too high.

Meanwhile, and advice welcome.

Cheers

LGC