retail news in context, analysis with attitude has a story estimating that "US retail ecommerce sales will total $259 billion, a 14.8% annual increase over 2012’s $225.5 billion.

The story goes on to note that "computer and consumer electronics, as well as apparel and accessories, account for the bulk of US retail ecommerce sales. Combined, they will contribute 42.9% of total retail ecommerce sales in 2013, rising to 45.6% by 2016. At the other end of the spectrum, large retail categories like auto and parts, as well as food and beverage, have disproportionately low sales online, indicating a lot of room for ecommerce growth."
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