Amazon is celebrating its best Cyber Monday ever. The e-commerce giant said today sales hit an all-time high of $7.9 billion yesterday. Items like the new Echo Dot, AncestryDNA genetic testing kits and Michelle Obama's memoir "Becoming" were among its top sellers. Amazon also said it sold more than 18 million toys and over 12 million fashion items on Black Friday and Cyber Monday together. Amazon noted its best-selling product worldwide was the Echo Dot smart speaker.
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