I have found that a plastic fish food container works just as well. You can actually wrap newspaper strips around any kind of can or cylindrical object. I tape them on the side, fold down the bottom and tape it, and they are good to go.

You can buy the paper pot maker here: http://www.seedandgarden.com/store/product/paper-potmaker-1030.cfm

Here is a link that might be useful: Newspaper Paper Pot Maker