You can go to an office supply store and buy hard mailers to mail your prints out in. The caveat is that they will probably have to go unmounted. 3X 10x14 mailers cost me only $3.99 at Office Max (I believe) which I'll use to mail any 5x7 or 8x10 prints (tape them to another piece of cardboard, cover w/ vellum paper, and then seal up. In the US the shipping is around $1.50 for first class and it goes letter rate air mail internationally (under $6).