Apparently M&M have this offer in the States where you buy M&Ms or Snickers bars at Target and you can send away for a candy dispenser.

Sometimes living in NZ sucks. Am thinking of contacting Mars NZ to see if they're going to offer them here. Because they look awesome.

Unfortunately Mars NZ don't appear to have a contact email, just a street address and phone number, so I may have to put pen to paper or some such.