Postal service has a new size flat regional rate box that will hold 2 game boxes. Its about 10.00 . I got a bunch of these for my auctions, They hold so many nice odd shaped & latger things.
Yep they are great. If you check their web site they often list other size boxes that they dont have at the post offices too. They ship them free to you also.
you can also find or make your own box & take it up there. many times its cheaper than flat rate. friend of mine works at the uspo & told me the cheaper way to go is make your own box