I use my library extensively through my kindle. Check to see if your library has overdrive/libby and borrow books through there. I need to go into the physical library once every year or two so they can re-verify my address but that's it. In addition, I read a lot of fantasy and scifi so I hang out on r/Fantasy a lot. I find a fair amount of free books for my kindle that way. You might be able to find similar deals on other subreddits for genres you enjoy.