amazon US does this nowwhat i'd like to see are scheduled community delivery days. Customers living in a particular district (collection of postal codes) would all get $1 off delivery fee if they would take delivery on, say, wednesday mornings.
i'm thinking of this for the improvement in air quality that would come from less vehicle traffic. It's crazy to think of so many small delivery vans all darting around & criss-crossing a city, all day long, every day.
if you select a slower delivery option you get $1 voucher towards digital services. renting a new movie for example is $5