Amazon.com likes to change the rules. First, it started selling books online. Then it launched an online shopping revolution. When it started the subscription service Amazon Prime, customers received two-day shipments for free. Each innovation caused a paradigm shift in how we shop and entertain ourselves.

Amazon is certainly not without competition. Walmart has definitely taken aim.

Learn which site offers cheaper prices, Amazon or Walmart.

More than 65 million people were actively enrolled in Amazon Prime last year, paying $10.99 per month or $99 per year. Many customers use their accounts for free shipping, but they don’t realize that other terrific benefits exist as well. Here are nine Prime perks that you may not be using.