Daily Star Online previously broke the news that Caroline Flack had been arrested at her north London home on suspicion of assault by battery.
She was later charged before appearing at Highbury and Islington Magistrates court on December 23 where she pleaded not guilty.
The item, which is currently on sale for £5.99, has been available to buy on Amazon.co.uk since July 7, 2019.
It is described as a notebook, journal and jotter, and is unofficial and not endorsed by Love Island, ITV or Caroline Flack herself.
A shocked Amazon buyer told Daily Star Online: "I was looking for stationery online and this Caroline Flack Is My Hero merchandise came up in the search.
"I was shocked to see it on sale, especially as she's no longer Love Island and all the current drama that's going on.
"It's no secret she's had a rocky time in the spotlight over the past few years so to a call her a hero is extreme."
They added: "I've seen lots of people online calling for Laura Whitmore to remain hosting Love Island for the summer series after she replaced Caroline.
"I can't imagine they will be very impressed when they see notebooks branding her a 'hero' for sale."
Earlier this week, Caroline took to social media to tease she is set to give her side of the ongoing drama.
Posting on her Instagram story to her 2.3 million followers, the blonde star wrote: "I’m going to speak today… mine and my family's life is no longer up for entertainment and gossip [sic]."
Caroline is yet to add any more detail about how or when she is planning to 'speak'.
Caroline's boyfriend Lewis Burton has also taken to social media to speak publicly about the case – shutting down reports that he has split with Carline.
Speaking during the hearing in December, prosecutor Katie Weiss recalled the night in question.
Ms Weiss said: "[Lewis Burton] made an allegation regarding his girlfriend Caroline.
"The first police officer arrived some eight minutes later.
"He knocked on the door and it was opened by both of them.
"Both were covered in blood and in fact one of the police officers likened the scene to a horror movie."
She went on to tell courts how Caroline was disruptive in police custody.
Weiss said: "Her behaviour gets worse, she flips over a table and then has to be restrained on the ground."