Amazon gives non-Prime members free shipping at $35 or more of eligible items. Instead of simply letting users get the product with free shipping, they’ve added a discount that prices it exactly one cent below the $35 limit, while only subsidizing the price with $3.38, which is about half of what they’ll then charge you for shipping.
Target also have free 2 day shipping and 5% discount if you use their “Red Card”, which is free. It’s available as a debit or credit card. I’m using the debit card version which doesn’t require a credit check or impact your credit score.
Sure, it lets them track what you buy, but they can already do that if you pay with credit or debit card. The only way to not get tracked is by paying cash or buying prepaid Visa/Mastercard gift cards and swapping them periodically.