This is what I'm thinking. Take a small (for Amazon) that will be dwarfed by people who sign up for or renew Prime memberships hoping to luck out on a similar deal in the future.
This super sale (if everyone gets what they ordered) will have much deeper impact than a 30 second commercial.
Believe next year, millions more people wil be looking for deals on amazon on prime day....
Well executed "price mistake" ;)