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Christmas in July? Amazon's 'Prime Day' is back

Amazon's Fire TV stick and a curved Samsung TV were top sellers during Amazon's second annual "Prime Day" sales bonanza.

The e-commerce powerhouse launched the event last July to promote its $99 annual Prime loyalty program, which offers free two-day shipping and other perks. Aside from a brief problem some customers had placing "Lightning Deals" into baskets Tuesday morning, no major hitches were reported.

ChannelAdvisor, which works with 3,000 retailers to sell products online including marketplaces like Amazon, said mid-day Tuesday that sales were in line with Prime Day 2015 in the U.S.

PiperJaffray analyst Gene Munster said ChannelAdvisor's...