Amazon, Target and Walmart all have big October sales, but which one is the best?

If you want to get an early start on your holiday shopping, three major sale events are happening this week. A few years back, Amazon launched a fall Prime Day, which it has since rebranded as Prime Big Deal Days. It runs from Oct. 6 to 7 this year.Not to be left out, Target and Walmart are also running their own fall sales this week. Each retailer is offering slightly different discounts on electronics, luggage and more. Here, we'll break down how to maximize your existing memberships and credit card offers to determine which sale is best for you to shop.Here are the basics of each sale:Amazon Prime Big Deal DaysTarget Circle Deal DaysWalmart Deals & MoreDatesOct. 6 to 7Oct. 6 to 7Oct. 5 to 11Start time12:01 a.m. PDT on Oct. 6TBDMidnight EDT on Oct. 5Membership requirementsYes, PrimeYes, free Target CircleNoneEarly accessEarly deals already liveOct. 5 for those who pay for Target Circle 360 membershipN/APaid membership costAmazon Prime: $139 a year or $14.99 a monthTarget Circle 360: $99 a year or $10.99 a monthWalmart+: $98 a year or $12.95 a monthNotable shopping portal ratesN/A2% cash back via TopCashback10% cash back via ShopBackAmazon Prime Big Deal DaysThe Prime Big Deal...