I'm not in anyway related to the below businesses but thought while on the forum id share my knowledge of what's out there.

Here in NZ we typically buy and bring in items from the states but we use a bit of Kiwi ingenuity and two guys I know manufacture Carbon stocks which are even lighter and cheaper than what McMillan offer.

Senator Rifle Stocks

https://www.facebook.com/senator.riflestocks

Stug Rifle Stocks

http://www.sggunstocks.co.nz/