Where do I find the cost for additional websites under my nation?
Hi Peter! Websites are included in the feature packages rather than being an a la carte item. The Leader package, starting at $29/month, includes 2 public websites and the Organization package, starting at $199/month includes 10 websites. You can find more on pricing here: http://nationbuilder.com/pricing.
Complete and current information on how to use NationBuilder is available in the documentation section.