Please visit many of the institutes listed under Think Tanks, Institutes and Organizations, as many of them have dozens/hundreds of books to chooses from, like the Mises Institute, EconLib and the CATO institute.
10 Books on Liberty You Probably Haven’t Read But Should: What to read when you’ve read it all?
Betcha Don’t Know Jack About Libertarianism: A simple, easy read for those just being introduced to the ideas of liberty. Suitable for high school and up, a great starting place.
The Bitcoin Standard (Book): Not only is this a great book about Bitcoin, it's also an amazing introduction to the history and theory of money. You will learn what money really is, and how manipulation of the money supply leads to a host of societal ills.
FreedomToons: Creating educational and satirical cartoons about freedom and liberty.
Libertarian Country: Libertarian Country is an online retail store specializing in liberty-themed apparel, accessories and books.
Libertarian Party Store: National's store for clothing, pins, brochures, door hangers, literature, yard signs, etc.
The Mad Statist: Where liberty isn’t just a pretty bumper sticker slogan. | Premium shirts, swag, memes & more.
Quantum Vibe: A futuristic sci-fi adventure series where libertarian principles and concepts are part of the societal background structure of the creator's universe. Description: A thousand years in the future, humanity has colonized worlds in nearly 100 galaxies, thanks to Quantum Vibremonic technologies developed five centuries earlier. Other new technologies have created various off-shoots of humanity and extended life expectancies five-fold. The story begins with how a mad scientist and his plucky assistant, along with their robot friend, brought humanity to the stars, and continues with the adventures of some unique people in fantastic places. It is highly recommended you start with the first volume.
The Tuttle Twins: Join the Tuttle Twins as they learn about liberty! Young readers will follow Ethan and Emily's adventures to learn about why freedom is important.
Uncle Eric Book Series: The Uncle Eric series of books is written by Richard J. Maybury for young and old alike. Using the epistolary style of writing (using letters to tell a story), Mr. Maybury plays the part of an economist writing a series of letters to his niece or nephew. With stories and examples, he gives interesting and clear explanations of topics that are generally thought to be too difficult for anyone but experts.
Voluntaryist – The Comic Series: Voluntaryist is the tale of a superhuman hero who finds himself pitted against the government as the government tries to enslave humanity once and for all.