After Khizr Khan pulled a pocket-sized copy of the U.S. Constitution out of his jacket at the Democratic convention, sales have spiked on Amazon (AMZN).

“Have you even read the United States Constitution? I will gladly lend you my copy,” Khan said during his Thursday speech.

On Monday, $1 copies of the pocket Constitution were the No. 1 best seller in the site’s history section, and No. 2 in books overall, beaten only by the latest Harry Potter book. Free pocket-sized copies of the Constitution are also available from the American Civil Liberties Union website until Election Day by using the coupon code “POCKETRIGHTS”—a deal announced on Twitter (TWTR) Friday.

In honor of Khizr Khan, get your FREE POCKET CONSTITUTION: https://t.co/wZdkZIahpi pic.twitter.com/875YWCeNZZ

— ACLU (@ACLU) July 29, 2016

Alternately, if your tastes lean conservative, you can pick up a copy in Spanish from the Heritage Foundation for just $2.50 online. The libertarian think tank Cato Institute also sells copies in English, Spanish and Arabic for $4.95 apiece, with bulk discounts available.

The U.S. Constitution is one a several books available for free on Amazon’s Kindle for those who prefer to consume literature on e-readers.