I'm not any kind of expert on all the various formats of eBay, but normally the listing, or insertion fee, is $0.00 USD. eBay makes its' $$ on the back end. They take 10% of the final sale price, plus 10% of the amount the buyer is charged for shipping. It sounds wrong for them to take a cut of shipping, but believe me, there is no way around it.
PayPal will also take a cut. It used to be $.29 USD plus 3% of the final sale price. I'm not sure what it is anymore.
There are online calculators to help.
I plugged in $1,800.00 USD with $25 USD local shipping. eBay takes $182.50 USD. PayPal takes $53.23 USD. You pocket $1,589. USDxx. Overseas shipping will stay apples to apples, so if you have to charge $150 USD, eBay will take $15. USD It just makes your lot a whole lot less attractive internationally in the long run.
I have no idea what NZ's tax structure is for online sales. Another thing to consider.
As an initial idea, I'd post to local newsgroups to promote interest, and try to do a face to face deal at a local bring and buy.