MAC Cosmetics is giving you a full-sized lipstick (one of three colours, taupe, teddy 2.0, or honeylove) with any purchase. There are a few exclusions like you can't get it with a purchase of gift cards, mini items, etc, but it looks like most purchases qualify. You can buy online, but if you want to avoid shipping costs, it looks like Farmers is also running the same deal in-store. These lipsticks are usually about $38 - $42 full price, so not a bad deal!
Farmers(farmers.co.nz)
Smith and Caugheys(smithandcaugheys.co.nz)
It's also available via Smith and Caugheys FYI - they have free delivery nationwide :)