http://www.constitutionfacts.com/index.cfm?section=bookstore&page=bookstore.cfm
http://www.thecapitol.net/Publications/PocketConstitution.html
https://secure.heritage.org/PocketConstitutions/?src=first
Other online downloads:
http://www.scribd.com/doc/17619024/Pocket-Constitution-The-Declaration-of-Independence-Constitution-of-the-United-States-and-Amendments-to-the-Constitution-The-Constitution-at-you
I keep them both on my cell phone as text files.
I will be sure to give ‘em my best Robert Byrd impersonation
Pocket Constitutions (at $3 each) work really nicely when you want to bump your Amazon.com order over the $25 to get free shipping.
The Heritage Foundation will send you a free copy also, or sell in bulk at a great discount:
https://secure.heritage.org/pocketconstitutions/
They are also available as apps for the iPhone. Weightless and always on hand!