Consumers are expected to spend, on average, €251 each over the cut-price shopping days known as Black Friday and Cyber Monday.
This is according to research from PwC which interviewed over 1,000 consumers here.
About a third of consumers said they expected to make a purchase over the period.
About half said they would be interested if an attractive deal presented itself.
36% of those who said they intended to shop over the period said they would buy up to a quarter of their Christmas gifts in that time.
A fifth of consumers said they had no interest in the bargain shopping days.
"With eight out of ten respondents interested in shopping over the Black Friday/Cyber Monday weekend, it is likely to be an intense shopping period which from the early Black Friday ads and deals, it is clear that the event has already started," John Dillon, Leader, PwC Ireland Retail & Consumer Practice, said.
"Understanding shopping behaviour is key to winning the sale. With advance research now a key element of everyday shopping, retailers need to be prepared to engage with these customers online, on social networks and in store," he added.