Only three months old, details as follows: 

http://store.telecom.co.nz/mobile/prepaid/lg-c900k 

Works great, awesome reception, very fast and with Mango (Windows Phone 7.1) update around the corner (free to upgrade) - selling it since I am now doing iOS development. 

Normally priced at $899 but if you use the 'buy now' function you'll receive free delivery. 

The phone does not come with a SIM card or earphones (any ear phones with standard connector will work) but will be shipped in the original box.

$500 or nearest offer.