I used to be in the book business. Yes, it is much cheaper but can be very slow. I would mail books via media to a town 60 miles away and sometimes it would be there the next day and other times it would take a week or longer. I think sometimes they see it is media and the put it on a shelf to wait. Last week when mailing some dvds via media they did not weigh enough so were sent first class. I made that comment about the shelf to the clerk and he got a funny look on his face. So now I am convinced there is a media shelf!