Kindle Unlimited gives you access to more than 4 million digital titles, including fiction, non-fiction, audiobooks, and magazines. It normally costs $11.99 per month, but during Prime Day, Prime members get three months free. I personally don't always read fast enough to justify the $11.99 a month, but I'll take three free months of it any day.

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Save $100 on the latest Kindle model during Amazon's Prime Day discounts. The Colorsoft Kindle has new and improved reading options, long battery life and adjustable lighting.