Credit to Quasar for finding this.
Warehouse has two promos going where you buy 1 and get 1 free.
LEGO CITY, LEGO FRIENDS, LEGO DUPLO & LEGO NEXO KNIGHTS BUY 1 GET 1 HALF PRICE; AND
ALL LEGO TOYS BUY 1 GET 1 HALF PRICE.
These are currently stacking.
For example
Buy LEGO City Volcano Exploration Base 60124 for $169.99
Then buy LEGO City Fire Station 60110 (normally $169.99) for $42.49!
remember
Orders over $100 are free shipping and click and collect is free for orders over $30.
Also Found these sets on Warehouse website reduced by 50+% already as far as I can tell (pricespy only tracking one which is 54% discount)
Not sure if they have more Angry Birds Lego sets in store as there are more sets available.
$19.99 (next cheapest is $49.99 @ Toyplanet) - Angry Birds LEGO Piggy Plane Attack 75822
http://www.thewarehouse.co.nz/p/angry-birds-lego-piggy-plane…
$47.99 (next cheapest is $105.00 @ Sego) - Angry Birds LEGO Piggy Pirate Ship 75825
http://www.thewarehouse.co.nz/p/angry-birds-lego-piggy-pirat…
$67.99 (next cheapest is $145.00 @ Sego) - Angry Birds LEGO King Pig's Castle 75826
http://www.thewarehouse.co.nz/p/angry-birds-lego-king-pigs-c…
There's a second promo "LEGO CITY, LEGO FRIENDS, LEGO DUPLO & LEGO NEXO KNIGHTS BUY 1 GET 1 HALF PRICE" and it seems to stack with the main promo "ALL LEGO TOYS BUY 1 GET 1 HALF PRICE". For example I purchased "LEGO City Van & Caravan 60117" ($35) and "LEGO City Ambulance Plane 60116" ($35) and I was only charged $8.75 for the second item. Combined with the free click and collect for orders over $30 this is an excellent price for Lego. I've placed 3 orders to maximise the discounts (each pair of items being around the same price) so I'm hoping they'll honour the pricing.