With the cost of shipping going sky high, The price of enjoying and sharing our hobby is making it almost completely cost prohibitive. All other forms of media are included under this lower rate such as CDs, DVDs, books, video tapes, computer readable media, and all other kinds of educational materials. If it is made of paper or cardboard, you can use media mail 99% of the time. Even if you don't mail puzzles to others, you still end up paying for the increases in postage when it gets included in the price of the puzzle you are buying. When the retailer purchases it from the manufacturer, they pay a high postage, They then include those charges in the retail price, which you pay. THEN you pay the price of high shipping to have it sent to you. God forbid you buy it as a gift, then have to pay high shipping 3 fold! There is no reason jigsaw puzzles shouldn't be included in Media mail. The Postal Service created Media Mail back in 1938 as a less expensive way to mail books.. It was originally designed to encourage the flow of educational materials through the mail. Puzzles, like books, are heavy, made of cardboard and should be considered to be educational materials.