Black Friday is usually more often thought of as a time to buy gadgets and TVs, but there are also great deals on books, the oldest gadget of them all.

Book sales tend to work a little differently than other deals — instead of specific stuff going on sale, you’re looking at category-wide discounts. Fortunately, if you need some ideas as to what books to get, we’ve got plenty of suggestions over in The Verge’s 2017 holiday gift guide.

Amazon

Amazon has one of the best deals in publishing around for Black Friday — a flat $5 off of any print book order of $20 or more. There are basically no restrictions to the deal: it simply has to be a book sold by Amazon, you have to get your order in before 2:59AM ET on November 27th, and it’s limited to one per customer. But if there’s a fancy cookbook or box set collection you’ve been eying for a while, now’s a good time to buy.

To take advantage of the deal, simply enter the promo code GIFTBOOK17 when you’re checking out.

Barnes & Noble

Barnes & Noble has a similar flat rate Black Friday deal — its offering 20 percent off any online order using the promo code GIVETHANKS, or 25 percent off a single item if you’re willing to trek out to a physical retail store with this coupon. There are a couple exceptions to the overall discount, like LEGO sets and Nook devices, but for the most part, it’s a great deal if you’re looking for some new reading material for the holidays. Both deals run through November 26th.

Audible

If audiobooks are more your thing, Audible is discounting 400 books down to $4.95. There’s plenty of good choices to browse through, but if you need any recommendations, consider trying Mr. Penumbra's 24-Hour Bookstore by Robin Sloan, Station Eleven by Emily St. John Mandel, or The Book of Speculation by Erika Swyler.

Book Outlet

While less well known than some of the other sites on this list, Book Outlet sells publisher surplus books at steep discounts. Selection can often be a bit of a crapshoot, but if you can find books there that you’re interested in, it’ll likely be cheaper than almost anywhere else. For Black Friday, the site is taking an additional 30 percent off everything in its catalog for what will probably be unbeatable prices.

Try starting with a $6.29 copy of Jeff VanderMeer’s Borne or V.E. Schwab’s A Conjuring of Light for $5.59 if you’re looking for suggestions.

Kindles

Ugh. Fine. They’re not technically books. But Amazon is also running deals on both Kindle hardware and Kindle ebooks, should you prefer digital text to actual printed paper.

For hardware, there’s the Kindle Paperwhite for $89.99 (usually $119.99) or the base model Kindle for $49.99 (usually $79.99). Amazon also have a bunch of discounted ebooks on the Kindle store, which you can peruse here.

Correction: Amazon’s deal is for orders of $20 or more, not $25 as this post already stated.