See below for everything you need to know about Prime Big Deal Days, plus our favorite picks for the best early deals to shop today. Prime Big Deal Days begins on Tuesday, October 7 and continues through Wednesday, October 8.Who can participate in Prime Big Deal Days? With Prime, you'll have access to exclusive deals and free shipping, as well as early access to Prime Day deals. What's the difference between Prime Day and Prime Big Deal Days? They are the same, but Prime Day falls during the summer and Prime Big Deal Days is in the fall.