Check out our Resources page. We have compiled our favorite online and local retailer for getting supplies!
Many of the activities are stand-alone units, but some activities do follow a nice sequence. If an activity has a ‘partner,’ there will be a note about related activities on each page. The only activity which requires that you have to do activities before it is Operation Design Challenge. This is a capstone project and requires that you do (at least) one activity from each module before embarking on Design Challenge project!
That is really for you to decide! We love them all!