It's simple, enter your email, choose the genres and authors you like most, and they will send you a daily email with different options that are either free or greatly reduced. I have to say although this is the time of year I don't have tons of extra time to read, I've already downloaded several books for the upcoming winter. The books never expire (unlike library books) so I'm taking the grab 'em when I see 'em approach. The only drawback I have heard from other Book Bub readers is that the quality of books are sometime lacking, but while I have seen a lot of fluff, there have been other quality reads mixed in, too.
Do you have any book sites you use and recommend? Anything else I've been missing out on?