My sister and I find our books at our local thrift store. Get hardbacks for prices between $.75 and $3.00 each. Lost about 60 books in my last move. Sure hope whomever got those books enjoys them. Thankfully I had a lists of all my books and with the help from my thrift store I'm slowly acquiring them back as well as a few new ones.
My mother who is 91 loves to read and finding books at the thrift store is ane asy fix for her. She used to go to the library but for whatever reason she no longer wants to go for her books so we keep her supplied this way. Afterwards we donate them back to the thrift store.