Nathaniel Sandler wants you to read, and he has put his profits (or lack of 'em) where his literature is: His nonprofit library has offered customers one free book every single day for the past nine years (each additional book costs $2). It's an eyebrow-raising business model that often leaves patrons exclaiming, "Free?! Really?!" Really! The radical bookshop is generously funded by the Knight Foundation and has given away 40,000 books in Miami to date. Billing itself as a no-kill shelter for books, Bookleggers happily accepts book donations at its green-and-white-striped book boxes around town, at its headquarters at the Bakehouse Art Complex in Wynwood (on Tuesdays), and by appointment. In May, the nonprofit launched a new Sunday pop-up from a former shoe store at 1600 Washington Ave. in South Beach, offering sunscreen, shot glasses, beach towels, bathrobes, and stacks of free books.