I have some ebooks (on general, steady, topics like "domain driven development" and "event sourcing" and the like), and I am still grabbing some nice bundles on

I have some ebooks (on general, steady, topics like "domain driven development" and "event sourcing" and the like), and I am still grabbing some nice bundles on Humble every now and then but I source most of my reading material from Safari / O'Reilly since a few years. My main reason to do this is because tech is moving extremely fast and you do not longer have to throw books away on topics which are no longer relevant. And a yearly sub at O'Reilly also prevents buying e-books on [enter the latest version of your favorite programming language/database/other tool here] over and over again...