Not an Amazon Prime user? You might be getting ripped off

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Amazon might be ripping you off — unless you're a Prime member.

According to a new report from a nonprofit news organization, Amazon's algorithm seems to steer many customers toward higher prices rather than the cheapest option.

Amazon's price-comparison pages are supposed to give customers the lowest price for any product.

But by shopping as a non-Amazon Prime member, ProPublica found the feature appeared to favor two different kinds of goods: items sold by Amazon or items sold by merchants who pay Amazon to warehouse and ship their products — otherwise known as "Fulfilled by Amazon."

Sign up for a 30-day free trial of Prime here.

The report found price-comparison pages seem to work fine for Prime users and those who get free Super Saver Shipping by purchasing stuff worth $49 or more.

But for customers who don't have Prime and don't qualify for free shipping, the lowest prices don't necessarily show up first.

RELATED: 17 awesome items on Amazon under $25:

18 PHOTOS
Items on Amazon under $25
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Items on Amazon under $25

Slow cooker crock pot, $20.99

Photo: Amazon

World’s strongest coffee, $18.99

Photo: Amazon

Toilet golf game, $11.99

Photo: Amazon

Potato chip bag resealer, $15.99

Photo: Amazon

Lifestraw water filter, $19.90

Photo: Amazon

Stuffed hamburger press, $10.29

Photo: Amazon

Camera lens coffee mug, $11.99

Photo: Amazon

Miracle berry tablets, $25.00

Note: These tablets transform ordinary foods into the extraordinary -- and mask sours food to taste sweet. 

Photo: Amazon

Ice luge, $21.30

Photo: Amazon

Glass ziplock bag, $16.85

Photo: Amazon

2nd skin unisuit, $25

Photo: Amazon

Retro corded iPhone handset , $20.99

Photo: Amazon

Unicorn mask, $16.98

Photo: Amazon

Venus fly trap, $14.99

Photo: Amazon

4,500 live ladybugs, $14.25

Photo: Amazon

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That's because those shoppers have to factor shipping into their prices. The rankings on their price-comparison pages include shipping costs, too.

But here's where it starts to get fishy.

SEE MORE: Amazon Is Experimenting With A Shorter Work Week For Some Employees

The price of items from Amazon or "Fulfilled by Amazon" merchants are ranked without shipping prices included, which makes them look like better deals than they actually are.

After ProPublica's report was released, Amazon said in a statement, "With Prime and Super Saver Shipping ... the vast majority of our items ... can ship for free. The sorting algorithms the article refers to are designed for that 90 percent of items ... "

ProPublica says its report is part of an ongoing investigation.

Now see the best-selling celebrity books on Amazon of 2016 so far:

11 PHOTOS
Top 10 best-selling celebrity books on Amazon
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Top 10 best-selling celebrity books on Amazon

"You're nobody until somebody calls you bossy." In her 2011 book, Tina Fey spills all about her rise to fame and what it took to claim that "bossy" title -- all with her signature comedic touch, of course.

BUY IT

Amy Schumer isn’t afraid to say what is on her mind and her new book proves just that. "The Girl With The Lower Back Tattoo" is full of personal, eye-opening anecdotes bordering on TMI. It's not all for the laughs -- Schumer will have you feeling every emotion before you reach the last page.

BUY IT

Growing up a tomboy in an era of women proud of their femininity, comedian Jessi Klein felt like an outsider looking in on this woman empowerment movement. In "You’ll Grow Out of It," Klein shares her struggles as a 21st century woman, including her "transformation from Pippi Longstocking-esque tomboy to are-you-a-lesbian-or-what tom man." Klein's great comedic mind book shines in this book making it a must-read this summer.

BUY IT

Amy Poehler started her writing career on top with "Yes Please," which became a No. 1 New York Times bestseller. She shares a plethora of stories, poems, photographs and mantras from her life sure to inspire and entertain all readers.

BUY IT

The uber-talented creator of "Grey’s Anatomy" and "Scandal" was challenged by her sister to say "yes" to the everything for a whole year. Rhimes hesitantly agreed and this book details how doing say, just saying "yes," changed her life. If Rhimes hasn't already changed your life with one of her hit shows, she surely will with this inspiring book.

BUY IT

Through a collection of hilarious and insightful essays, Mindy Kaling details her continuing struggle to find peace and joy as an adult, as well as her finding her place in Hollywood despite constantly being reminded that there aren’t many others that look like her. 

BUY IT

Acclaimed TV historian and entertainment writer Jennifer Kelshin Armstrong celebrates the iconic Seinfeld sitcom with her book "Seinfeldia." Armstrong gives readers the inside look of the show while it was still on air and delves into the world of devotees who still adore the show today.

BUY IT

Mindy Kaling’s debut book, "Is Everyone Hanging Out Without Me? (And Other Concerns), leads readers on a tour of her life and into her mind, both of which reveal that Kaling, despite her celebrity, could easily be the girl next door. 

BUY IT

Republican presidential nominee Donald J. Trump shares his story of his rise to America’s foremost deal maker. In the most Trump-esque way, the businessman-turned-politician opensup about his greatest accomplishments, shatters myths and reveals how exactly to close the deal. 

BUY IT

"Finding Dory" star, Ellen Degeneres, holds nothing back in this tell-all book about her life in recent years, including the hardships she faced prior to landing her "Finding Nemo" gig and namesake show. She just kept swimming and it has paid off pretty well.

BUY IT
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