Media Mail is a slower service.  Media Mail shipments are generally sent via cargo ships, rather than planes.  They will take two to four weeks to reach their destination, compared to up to a day for most other shipping options.
assitant
Media mail is most economical for items that are up to 17 inches x 12 inches x 9 inches, and the books would need to fit in that.   If you have the box prepared for shipping, I can help you select the best carrier for you based on where you’re shipping to and how you’re shipping it.
assistant
Which shipping carrier is cheaper for shipping packages?
user
Which package do you want to ship, and where to?
assistant
I want to ship a box of books to Texas from Maryland.
user
If you go with the least-expensive service, Federal Express should be the cheapest option, around $20.  If you ship within the continental United States, UPS or USPS are similar, and would be less than $25.  Or if you are willing to pay more, you could ship with the United Parcel Service, which will be more expensive.
assistant
I heard about using Media Mail from USPS. I think I can ship books cheaper if I use that service.
user
How large is the box you want to ship?  Is the box made of cardboard, or is it a large wooden box, or something else?
assistant
It is a medium sized box with about 10 paperback books in it.
user