Black Friday has become one of the biggest sales days around the world but new research shows some discounts may be dud deals.
Pricing and comparison service PriceSpy says nearly one in five products it listed saw a price hike on Black Friday, a marked increase of 7 per cent compared to last year.
More than one in 10 products offered a fake sale, where the price of an item was hiked ahead of sale day to make the Black Friday discount look better than it was.
"The bigger Black Friday is becoming, the more we have seen a spike in the number of fake sales being offered, which is really disappointing to see," said Liisa Matinvesi-Bassett, New Zealand country manager for PriceSpy.
Computers and accessories, mobile phones, games and consoles, and speakers and headphones saw the biggest number of price hikes, even though the same product categories also saw significant price drops.