Never let it be said that Miami is not a trendsetter. Well before pop-up restaurants and pop-up bars exploded in popularity, Miami began hosting a pop-up of its own: the Friends of the Library Annual Book Sale, which has been springing up during the holiday shopping rush for the past 11 years. For most of the year, the downtown branch of the Miami-Dade Public Library System is just an average city hub for book lending and covert napping. But for five days of every year, usually in early December, it transforms into this city's best bookstore. Tens of thousands of books, CDs, and DVDs are available for purchase, making it one of the largest book sales in South Florida. The prices reflect some killer discounts, so you can justify fleshing out your home library as well as picking up a couple of titles to wrap up as holiday gifts. And your friends and family won't be the only ones who'll benefit — sales proceeds go toward funding the library's cultural and literary programs. So when you buy a book to read, you're also helping others do the same. It's hard to get that warm, fuzzy feeling from downloading an e-book to your Kindle.