He has a Kindle with Special Offers, and at one point accidentally bought one of the Special Offers that came up, said offer being $40 for a class on interior design.
His post seemed fairly straight-forward, so people appear to be downvoting you for asking a question that a cursory re-reading of it should have made clear.
It was not clear to me that he purchased one of the offers by accident. I thought he meant he accidentally ordered one of the subsidized kindles by accident.
