Donald Trump is down 10 points in a new Fox poll, but are American voters really behind the Democratic candidate? People seem to be putting their money where their sentiments are in a bigger way — because anti-Hillary merchandise is flying off the shelves.

This week, three of the top five best-sellers on The New York Times’ Combined Print & E-Book Nonfiction and Hardcover Nonfiction book lists are decidedly anti-Clinton.

“Armageddon,” by political strategists Dick Morris and Eileen McGann, details a plan for how to keep Hillary out of the White House.

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“Hillary’s America,” by filmmaker Dinesh D’Souza, also warns of disaster should Clinton capture the Oval Office.

“Crisis of Character,” by Gary J. Byrne with Grant M. Schmidt, leads the anti-Clinton literary parade. In the book, former Secret Service officer Byrne details scandalous behavior by the Clintons. Byrne’s book was No. 1 on Amazon for four weeks before it was even published in June, despite the fact that when it was released the author said he had been “shunned by every mainstream media outlet.”

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D’Souza is doubly cashing in on Clinton. His “Hillary’s America” is already the highest-grossing documentary of the year, having made more than $9 million since its release July 15.

The last documentary to do that well was the Amy Winehouse documentary, “Amy,” released July 3, 2015. It grossed $8.4 million over 28 weeks, according to The Washington Times — so D’Souza is already well ahead of that mark.

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“Hillary has made a lot of money off of the American people,” D’Souza told The Hollywood Reporter. “So we’d like to make a little off of her.”

And plenty of entrepreneurs are making money off her. The Hillary-bashing business “is huger than even Trump himself might imagine,” reports THR.

It was particularly evident at the Republican National Convention, where scores of vendors flocked to Cleveland with Trump bottled water, Trump breakfast cereal, and the ever-popular “Make America Great Again” baseball caps.

The anti-Hillary goodies bore much stronger language and colorful references, such as a T-shirt that says simply, “Hillary for Prison 2016.”

One vendor in Cleveland, a self-published author named Loren Spivack, told THR that he was making about $150 an hour selling his anti-Hillary “children’s” books that parody Clinton.

For example, his book, “The Wizard of Iz,” is a story that shows what happens “when a tornado blows Dorothy from her constitutionally governed America (circa 1900) into the 2016 election (her house lands on Obama). She must rescue the Free-Lunchkins from the slavery of welfare dependence, save the brainless scarecrow from the mindless indoctrinations of graduate school and help the cowardly RINO — Republican In Name Only — find some courage.”

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Bumper stickers are always a popular election commodity, including “Hell-ary” and “Oh $h*+ Life’s a B*+cH, Don’t Elect One.”

The Federalist noted its favorite features a photo of Obama and says: “I Put America in the Toilet, Vote for Hillary and She’ll Pull the Handle.”

One of the “buzziest,” if not best-selling bumper stickers, according to The Boston Globe, is from a software engineer in Tennessee. He came up with a bipartisan and somewhat depressing slogan: “Giant Meteor 2016 — Just end it already.” Price? $9.99.

Seems a little steep, doesn’t it?