Even Amazon recognizes the importance of building an email list of subscribers which is why they are running a promotion of giving a high quality Kindle romance book (promotional credit) when you subscribe to their free newsletter “Kindle Delivers Romance”.
This promotion is only for new subscribers and ends in a couple of days. If you typically shop for Romance you’ll probably see the promotion on the home page, but if not, you might be able to click on the “Romance” section of Kindle books.