You can quite often get a $300 yearly sub to O'Reilly, they run a discount ~4 times a year.

That said, like a lot of other content subscriptions, it can be quite anxiety inducing to make it seem like you're getting your money's worth. I've gotten the sub via my work, and I think the labs and videos are quite good, plus the occasional opportunities to do live-chats with the authors. But you have to sift through a lot of content and dedicate a lot of hours to use them. For most folks, I think buying a few technical books a year as needed would be a much better use of time and money.