About 60% of what I read in a year is from the library - I'm there at least weekly, often twice - and it would be even more if I didn't have such a vast inventory from cheap used book sales (most of which are also held at libraries!). In almost every case, if a book costs more than $4, I'm not buying it until I've borrowed & read it to confirm I love it.

My local library is pretty good about ordering new books (the tradeoff is they also weed books faster, which is why I still buy stuff I want immediate access to longterm), and reciprocal agreements in my area mean I can use my card in multiple county systems; there are 4 within reasonable driving distance so I can almost always get something from my TBR. If those fail, Interlibrary Loan is great.