Target is taking on Amazon Prime Day with its very own two-day summer sale—the biggest sale of the season—that just so happens to also take place July 15 and 16 (the same days as Amazon's summer mega-sale). What does that mean for you? Your wallet may be hurting come July 17, but you also could have a boatload of new stuff arriving at your door and a list of savings to brag to your friends about.