Black Friday originally started in America before coming to Britain last year. Retailers big and small slash their prices in the run-up to Christmas in the hope to generate more sales.
Reporters described "chaos" on last year's Black Friday, with several people being arrested and a woman being hit by a falling television. Hundreds of millions of pounds was spent.
This year, analysts believe consumer spending will top £1bn - the most on record.
Karen Grima, from Christians Against Poverty, told Premier: "The problem is you find a lot of people buying things they don't need. There's also a lot of stigma around Black Friday in terms of people literally running over each other to get the latest thing.
"It can make people feel small as well, if they can't afford the things that are in the sales.
She said that helping people in debt is a major part of the charity's work, and "a lot of it's linked to credit cards".
"It's just really difficult to see that people have been pressured into buying things on credit cards, to getting out payday loans, to basically buy things with money they don't have and the really negative effect that has on people.
Before making a purchase, Karen said "it's good to think whether or not it's a good use of God's money, and also to think more generously at this time.
"Could you be using your money to be more generous at this Christmas period? Is there something that you could be putting that money towards? Have you accounted for that money when you've made your budget for Christmas?"
Listen to Premier's Aaron James speaking to Karen Grima here:
