No cost, NErider. I'm taking a World History course through Coursera, also and there was a suggestion that you buy the text, but it wasn't a requirement. This course had no such suggestion.
I think a facebook page for COTHers would be a wonderful idea. Or, maybe someone with a lot more computer smarts than me could create a free forum. With that, we could divide what we are talking about into distinct topics. That might make it easier to find information, if the quizzes turn out to be open book. Whatever is decided, I want in on it!
Woohoo! I'm glad others are doing it too. I tried to get friends to join with me but they declined. I may need a support group to keep up the motivation to finish it but it looks like it will be interesting.