OK, loads of stuff is no longer available in NZ, I'll re-write the list for you here:
MEGA sets in New Zealand
Note: This list is of the sets I can find online or at my local stores. Other stores in other parts of the country will have different stock.
FARMERS DEPARTMENT STORE
CoD
ATLAS Troop Pack $30
Icarus Troop Pack $30
HALO
Promethean Troop Pack $30
Charlie Series $6
Pokémon
Assorted small figures (Poke-Heroes) $13
Picachu VS Bulbasaur $30
Squirtle VS Charmander $30
Wartotle $25
Ivysaur $25
Charmeleon $25
Charizard $45
Gyarados $60
The Warehouse
TMNT
Raph/Mikey/Donnie/Leo Pizza Vehicles $15
Drone Pursuit $10
Turbo Board $10
Mighty Ape
Star Trek
Teleporter Room $135
Guardian of Forever $50
Destiny
Atheon ($40)
Cabal Interceptor ($65)
Fallen Walker ($160)
2016/first-wave 2017 Sparrows ($40)
Toyco
Minions
Series 10 $5
TMNT
Casey Jones $8
EB Games
Assassin's Creed
Gunboat Takeover $100
Chariot Chase $40
Toy World
Halo
Promethean Troop Pack $35
Promethean Weapons Customiser Pack $15
UNSC Spartan Customiser Pack (2016) $15
CoD
Icarus Troop Pack $35
Brutus $5
Seal Specialist $5
Ghillie Suit Sniper $5
Juggernaut $5
Minions
Series 3 $5