They're small, individually wrapped in foil and handed over in piles at Countdown checkouts. But to hundreds of New Zealanders, they're priceless.
Trade Me auctions and Facebook swap groups are drawing hundreds of hopefuls trying to complete their sets of the collectable DreamWorks Heroes Action cards.
One card is given out for every $20 spent at Countdown stores and online. There are 42 cards to collect. Customers can also collect bonus cards for buying specific products.
Cards are being listed on Trade Me for everything from $1.20 for one card through to $200 for a full set.
Countdown's general manager for marketing, Bridget Lamont, said more than half the collector albums designed to hold the cards had sold in the first 10 days and the DreamWorks Heroes app, which allows collectors to play with their collected heroes, had been downloaded 7,000 times.