I have an Asus RT AC66u router for sale. $220 pickup from Miramar, Wellington. Add $10 for delivery anywhere in NZ.

Cheapest place I know you can get these is Alpha City for just under $300 exluding shipping.
Price spy:
http://pricespy.co.nz/product.php?p=1291082
I am happy to flash either dd-wrt or the stock Asus firmware onto it for you.
Router is in perfect condition. Box is a little worn.
I will add more photos and details when I get home from work.
Reviews:
http://www.engadget.com/products/asus/rt-ac66u/
http://www.trustedreviews.com/asus-rt-ac66u802-11ac-router_Peripheral_review
http://reviews.cnet.com/routers/asus-rt-ac66u-802/4505-3319_7-35406080-2.html