Hard copy of the transient images on a video can be really helpful, especially when revising notes later, but providing these pictures can be expensive. In this case, it isn't a question of your time, but rather that the equipment isn't that common yet. Grabbing a frame from a video isn't difficult. You can then blow this up, add it to a word processed document, or print it. Try AV departments, art and design labs, computer science departments, and computer-aided teaching resource centres.
Technology changes rapidly.
Keep your eye on the digital camcorder and digital camera markets. Accessories for these such as home printers can be pressed into service. Finally, don't forget older approaches. There are plenty of resources on how to make videos. Most of the comments below therefore focus on multimedia production, since this is a growth area for teaching materials and offers most opportunities for enhancement.