Swap, Borrow or Lend ebooks with e-book rental | eBookFling.com
eBookFling is an online library service for Kindle and Nook e-books. You can list and lend any of your e-books for free. After 14 days, the book is automatically returned to you so you can lend it again.
Lending a book will earn you one credit - credits allow you to borrow from the thousands of e-books on the site. If you don't have any credits, you can borrow an ebook for $3, but you shouldn't need to do that.