Amazon

Amazon is the largest online store, as it offers an unprecedented selection of items across a wide variety of categories. Amazon's stock ranges from electronics to toys to clothing to furniture, among dozens of other categories.

Known for its Amazon Prime membership program with free shipping, Amazon also offers many online services for music, videos and books, in addition to grocery delivery services like Prime Now and Amazon Fresh.

Though it's already one of the most affordable stores online, you can save even more with these Amazon coupons.