However, Summerfruit New Zealand said there is definitely no shortage of plums.
In Wellington, one plum chocolate enthusiast's brother took the initiative after she struggled to find the chocolate in her local New World in Porirua. He surprised his sister, Jenny Porter, quietly leaving two blocks in her letterbox.
"They were two blocks out of the six left in store. It's one chocolate that's very difficult to find," said Ms Porter.
The range was released in May this year, with Nigella Lawson as the face of the campaign.
There are three other artisan bars to choose from, including Supreme Coffee in Dark Chocolate, Ginger and Kerikeri Mandarin, and West Coast Buttermilk Caramelised White Chocolate, but the plum flavour is still being missed.
Whittaker's Chocolate has gone from strength to strength, providing the chocolate base for Lewis Road's Fresh Chocolate Milk, and was rated New Zealand's most trusted brand by Reader's Digest last year.