I understand your dilemma. I read slow too. So one possible solution that is maybe not as preferable to buying your own copy is to actually copy the book, for your own use only of
course.
When you do check out the book, instead of using the time to read it, scan it into an electronic file or photo copy the pages. Now obviously you cannot use this to publish nor would I suggest that. But if you keep it all to yourself, then i dont think you'll invoke the book police to come raid your home in the middle of the night 😉. Then you'll have unlimited time to read at your leisure. Then you could also continue your search to buy a set of
books when they become available if you still wish to have your own copies of the physical book. Best of luck at this.