i tend to buy books on-line now, much cheaper (richard and judy ones worked out at about £3 each bought on-line). or at costco, i've had a number of sets of 8 books from them for around £8.99 which is really cheap. good authors too, at the moment i'm working my way through a set of crime fiction by female authors - lynda la plant, clare francis, etc., and none has let me down yet.
i'll only lend books to certain people, never throw any away or get rid, just can't bear to even though i rarely, if ever, read them again. they just keep stacking up in the spare room. i did have a major clear-out a couple of years ago but it felt like i was giving my children away.