Amazon has increased its minimum order for free shipping to $35 - up by $10.
It's the first price hike in 10 years, with the online retailer previously offering free five-day shipping to non-Prime members with a minimum order of $25.
While the company has not commented, commentators say today's news could be a bid to encourage consumers to buy an Amazon Prime subscription.
Since it was founded in 1996 by CEO Jeff Bezos, Amazon has become a global retail power and dominates the e-book market.
However New York Times reported that the constantly diversifying company lost money last year, with analysts anticipating another loss when Amazon releases its third-quarter results on Thursday.
Yet the stock is at a record high.
Amazon is expected post $75 billion in revenue this year.
Analysts have speculated that the retailer is trying to boost its profits by raising prices on certain services.