I love Pop Rocks. You know: the candy? These are sold all over the US at Hobby Lobby, Walgreen's, Target... so they should be easy to find. They are also in Europe and Canada in Candy Shops and Grocery Stores. If you are utterly out of luck there- you can order it here: http://www.poprockscandy.com/order.html.
Pop Rocks has a fascinating history- including being part of Urban Legends that Mythbusters have dispelled... Just for the record, Adam Savage is a GOD. LINK: http://dsc.discovery.com/fansites/mythbusters/episode/00to49/episode_11.html
You can find out more here:
The Pop Rocks Web Site: http://www.poprockscandy.com/
Wikipedia- Pop Rocks Entry: http://en.wikipedia.org/wiki/Pop_Rocks
The Pop Rocks Book Pop Rocks: The Inside Story of America’s Revolutionary Candy: http://www.specialtypublishers.com/
The Pop Rocks Patent: http://patft.uspto.gov....
About Chemistry- How Pop Rocks Work: http://chemistry.about.com/od/howthingsworkfaqs/f/poprockscandy.htm