Amazon has one of the best deals on the Samsung Galaxy S8 and S8 Plus right now, as a number of other sellers have ended long-running sale prices.  This summer has seen a lot of price cuts for the Galaxy S8 and S8 Plus, with one of the best being $150 off, bringing the prices to $574 for a Galaxy S8 and $674 for a Galaxy S8 Plus. Samsung and Groupon...