Does anyone know where you can buy open ended cardboard boxes like the tv seasons come in? I would like to put my own thinpaks in them. Thanks.

I have yet to see that. Then again I have not been looking. You may want to just try searching some media supply sites. They may have something that you can use.

Do you mean blank card so you can print on them?

I was thinking the hard cardboard cases used to contain multiple thinpacks and multidisc sets.