"Normally people's pay days change but last year they didn't. Some people seemed to leave it until they got that last pay cheque."
The shop was busy with locals, tourists and people returning home for the Christmas break, Ms Shepherd said. "We get a lot of locals but also a few tourists and people who come in because they know the shop. We have a lot of New Zealand authors and illustrators so tourists often pop in and get something when they're passing through.
"We also have people who come home to see family in December come in because they remember coming here as a child themselves and perhaps want to bring their own children in."
New Zealand products, box set books, and Bunch O Balloons - 100 water balloon packs which fill up in less than 60 seconds - were popular gifts, she said.
Nationwide, Kiwis spent an extra $397 million in December compared to the previous year. The growth for the entire country was up almost 8 per cent to $5.493 billion. Paymark suggested several factors were behind the overall increase in spending, including the Reserve Bank cutting the OCR to 2.5 per cent per annum in early December.
The Bay of Plenty, Marlborough, Auckland and Northland, and Southland saw the strongest spending growth in the country with the Bay of Plenty breaking into double figure growth at 10.1 per cent over the same month in 2014.