I came across this site today that claims to have 30,000 free books online. It looks like the majority of those are classics. As a test I checked the last book I read (Kafka) and he was there ready to read! The thought of sitting in front of a computer to read a whole book is not appealing to me, but I can think of better possible uses. It’d be fine for short stories or to read a few chapters to see if they interested you enough to get the book. Check it out.