Amazon is kicking off its third annual Prime Day by slashing the cost of an Amazon Echo, cutting 50 percent off the price tag, and selling the Echo for only $89.99. Google is competing by cutting $64 from the price tag for a Google Home and Chromecast bundle, selling the two for $99.99. So, if you’ve been wanting to get a smart assistant for your home or get a jump-start on Christmas shopping, now is a good time for it.