Bargain hunters can start preparing for Amazon's next big Prime Day sale. Prime Day is the company's biggest event of the year, with thousands of discounts across every category from tech to home goods and more. The 10th iteration of the event is set to kick off this July, offering exclusive savings for Amazon Prime subscribers.  Amazon has announced that there will be plenty of back-to-school supplies available as well, helping early shoppers get everything they'll need before classes resume, so plan accor ...