Air fryers, games consoles and personal heaters are among the products most likely to be targeted in Black Friday scams online.
NatWest estimates up to £10,000 could be stolen from consumers in the UK, as fraudsters advertise fake deals.
The bank is warning scammers are taking advantage of people who are trying to save money on their bills, as the cost of energy rises.
Shoppers searching for deals on PlayStations and Xboxes are also reported to be vulnerable to online scammers today.
NatWest is warning shoppers to be aware of goods advertised online at a heavily reduced price, or time-based deals that add pressure to buy without thinking.
The bank says scammers regularly target people online through Facebook Marketplace, Instagram, Twitter and eBay.
25-35 year-olds are most likely to have their money stolen online, followed closely followed by 18–25 and 35-45-year-olds.
The bank says these age groups are more likely to feel confident buying products online.