Online shopping

Looking for a case study who regulalry saves money on online shopping by making use of first order discounts or discounts because they signed up to a retailer's newsletter. Ideally the case study would be able to say something like “I never pay full price for anything"… and then explain how it's done.

Case study needs to provide a decent photo.

Also looking for expert comments on how to save money shopping online - discount codes, browser extensions, cashback, abdonned baskets etc or any new methods.