I get notifications on Facebook and via email through places like Pixel of Ink and Book Bub about free or bargain books.
Like you said, some are good, some are trash (if they're free, I don't feel like I've wasted money if they stink) but most are in the middle.
I've gotten quite a few classics from authors like Orson Welles, Dostoyevsky, Poe, etc.
Some more obscure books, like some that were written in the 19th Century.
One Kindle book I bought when it first came out was Stephen King's "1963". I forget the price, but it was WAY cheaper than my stepdaughter paid for the hardback version she got me for Christmas that same year, not knowing that I already had the Kindle version.
Then there are other books that I've bought over and over again in paperback because I wore them out from rereading them over the years. One of my favorite authors is James A Michener. I think I've read a few of his novels (Hawaii, Chesapeake, and Centennial) at least six times each. Having them in e-format is awesome. 
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