Offroad-Express

Just read today in the news, NZPost is introducing a new service out of US.

http://www.nzpost.co.nz/products-services/postage-packaging/youshop

I have used www.buyusa.co.nz in the past and found them reasonably okay. However, NZPost now stepping in the same business off the back of Singapore Post it would interesting to see what happens.

I use myUS.com. $10 setup and you pay freight as normal. They'll amalgamate multiple parcels into one and they always make sure the packages are under customs gst threshold.
Carriers used have been DHL or usps with them. easy as and fully trackable.

Ship2u is much better. They provide consolidation which youshop do not. and you can track your item with ship2u website.

iv had a bit sent over (jeep stuff is cheaper in the states) with youshop over the past few weeks and iv found about 3/4days from oregon couriered to my doorstep. iv got no complaints so far.
cheers

Yup been using YouShop for a while now. Great service, maybe not the cheapest but easy and yes you can track and combine orders.