Not sure if your device supports connection to your public library, but I have been reading literally hundreds of books since Covid on my iPhone using Libby at first, and now the Palace Project. I still purchase the odd book if it’s one I know I will read repeatedly but I haven’t bought an ebook in some time due to using the library.

Good list, btw. I loved the Arkady Martine books. You might want to try Gideon the Ninth and the sequels.

The one downside to the library option that everyone is suggesting as someone who has been subscribed for a while is that if the book is popular, you only get it for a few weeks at a time.

I tend to read just a few pages at a time before bed, and I found myself struggling to finish books on time. Or a book I wanted became available during a week when I really wasn’t in the mood to read.

If it takes you more than two weeks to read a book, it might not be a good option for you. Though it is free to try.

I have found Kobo and Z-Library to be worth it for sci-fi.

As everyone here is suggesting, the public library is the best way to get sci fi for the Kindle. Whatever app yours uses, it just connects you to Amazon to download the book for free, for 1-3 weeks, whichever you choose. Sometimes there is a wait, place a hold and it shows up eventually.

I tried KU for a month or two but I couldn’t find enough good books to read to justify the cost. Instead I just got a digital library subscription and read on my phone/tablet.

I buy via B&N, Kobo or the Play store. B&N and Kobo tend to have better quality epubs (embedded fonts, larger images) but the play store runs more sales. I don’t buy ebooks from Amazon, their deals with publishers don’t pay authors enough money. If at all possible I try to buy self published ebooks to support authors directly, same deal with magazine subs - I pay Clarkesworld and Lightspeed directly and download epubs from them.

If you like Space Opera, try the Kris Longknife series (starting with Kris Longknife: Mutineer) and the Aeon 14 books by M D Cooper (starting with The Complete Intrepid Saga) - all of which are on Kindle. Also on Kindle: Columbus Day (Expeditionary Force Book 1) All books in the series John Ringo’s Empire of Man series starting with March Upcountry

Check out the Omega Force books. They are a really fun read. Sort of like Guardians of the Galaxy but less magicky.

IDK about sci-fi specifically, but I have scribd and use it extremely heavily, mostly for audiobooks, but they usually have both if they have an audiobook.

Discoverability isn’t great, and the catalogue is not comprehensive, but it’s reasonably large, especially compared to Kindle Unlimited, and I can often listen to complete series (I mostly read mysteries, personally). Sometimes, if you read several books of a series in a month, it makes you wait until the next month to start a new book in that series or by that author, but I read a lot of books and don’t hit that that often. I can give a link to a 60 day trial (you can use PayPal and immediately cancel the renewal through the PayPal interface to avoid a charge) if you want it.

I also use Libby and Hoopla through my library. They have different models and different libraries, but there is a lot you can read for free legally.

K U is awesome on the free trial but I wouldn’t (didn’t) renew for money.

I use smashwords personally, they don’t have all the big authors but I have read dozens of multiple book series, and lots of them are free