The stats are in, though our wallets may be lighter. This morning Amazon announced sales from its third Prime Day event surpassed Black Friday and Cyber Monday, growing by more than 60 percent from last year. Unsurprisingly, the company’s voice-poweredAmazon Echo was the best-selling item of the day, more than doubling U.S. Echo sales on Prime Day last year and tripling sales worldwide. But the real bargain item of the day was a deeply discounted DNA ancestry test kit by 23andMe.