Online shopping from the earth's biggest selection of books, magazines, music, DVDs, videos, electronics, computers, software, apparel & accessories, shoes, jewelry, tools & hardware, housewares, furniture, sporting goods, beauty & personal care, broadband & dsl, gourmet food & just about anything else.

How much they make:
Where they're located: Indianapolis, Indiana, USA
Current team size: 1
Website traffic: 2.65B/month

4. Etsy

Etsy is the worldwide commercial center for exceptional and inventive merchandise. It's home to a vast expanse of uncommon, phenomenal things, from special hand-tailored parts of vintage treasures. Here, you can also get a wide collection of beautiful jewelry suitable for women of all ages.

Website traffic: 407M/month

5. Costco

Costco.com is the online platform of Costco, a membership-based warehouse retailer known for its bulk discounts on a wide range of products. The company was founded in 1976 by James Sinegal and Jeffrey Brotman. Costco serves a diverse customer base looking for value and quality. With over 270,000 employees worldwide and generating billions in revenue annually, Costco has established itself as a leader in the retail industry.

Where they're located: Omaha, Nebraska, USA
Website traffic: 89.2M/month