I found a web 2.0 tool called Xtranormal that allows you to turn your text into a 3D animated video. Like most tools, there are different plans and fees. The basic free plan only allows you to create two videos. The educator plan is $10 for the teacher and additional 50 cents per student EVERY MONTH, but it allows unlimited use. The educator plan also allows teachers to create student accounts. One negative I found with the web site is some of the sample videos include profanity, and are inappropriate for children. One of the features listed under the educator account is a kid-friendly environment, so you have to pay to block the inappropriate content.
If you would like to find out more about the educator account, watch the following video.