With Amazon Prime Day just around the corner, early deals are already starting to appear ahead of the four-day event, which runs from June 23 through June 26.

If you're looking to stock up on graphic novels before the sale officially begins, Amazon has quietly brought back one of its best book promotions, letting shoppers buy two eligible books and get a third free.

The offer covers a selection of DC Compact Comics editions, making it an easy way to build your collection without spending a fortune.

Buy 2 DC Compact Comics, Get 1 Free

Amazon's latest "3 for 2" promo is refreshingly simple - here's how it works: add any three eligible items to your basket, and the cheapest one will automatically be discounted at checkout.

Better still, the offer stacks, meaning you can pick up six books for the price of four, nine books for the price of six, and so on. If you've had a growing reading list sitting in your wishlist for months, this is one of the easiest ways to save ahead of Prime Day.

Tom King's "Supergirl: Woman of Tomorrow" is one of the standout picks, and down to just $7.90 right now. With the upcoming Supergirl film set to release on June 26, now is the perfect time to read the comic that inspired it. This is one of my favorite comics of all time, and means a lot to me. I highly recommend picking it up.

Batman fans are equally well served. Scott Snyder and Greg Capullo's "Batman: The Court of Owls Saga" remains one of the defining modern Batman stories, while "Batman: The Long Halloween" continues to be essential reading thanks to its influence on multiple live-action adaptations.

Other highlights in the promotion include "All-Star Superman," Grant Morrison's celebrated take on the Man of Steel that heavily inspired James Gunn's excellent Superman film, alongside classics like "Kingdom Come," "Watchmen," "Batman: Hush," and "DCeased."

One of the biggest advantages of the DC Compact Comics line is the format itself. These editions are smaller and more affordable than standard trade paperbacks, making them ideal for commuters, holidays, or anyone trying to save shelf space.

Whether you're catching up on iconic Batman stories or diving into acclaimed Superman runs ahead of the next wave of DC movies, there's plenty worth adding to your basket here.

Unlike many Prime Day offers, this early promotion isn't exclusive to Prime members either, meaning anyone can take advantage of the deal before the main event begins next week.

These promotions are generally the best time to buy books, especially since other popular series are also include in the sale, such as Dungeon Crawler Carl, and Brandon Sanderson's Mistborn.

If you just want to read books and comics as cheaply as possible, I'd also recommend utilizing a Kindle Unlimited subscription as well. Amazon is currently offering three months of the service for free to Prime members, but for new subscribers only.

If audiobooks are more your thing, I've also got you covered. There's an Audible promo that's worth checking out going into Prime Day. New subscribers can get the Audible Standard plan for only $0.99/month for the first three months, which includes one book per month.

For DC fans, I'd recommend checking out the audio versions of "All Star Superman", "Kingdom Come" - both of which are excellent adaptations.

Robert Anderson is IGN's Senior Commerce Editor and resident deals expert on games, collectibles, trading card games, and more. You can follow him @robertliam21 on Bluesky.