Gunslinger,
Dixie Gun works has a cool little half scale cannon that would work for your front yard.
http://www.dixiegun.com
Other somewhat inexpensive cannon makers are at...
http://www.specialtymile.com/southbendreplicas/
http://www.ironhorsecannons.com/
http://www.hernironworks.com
Your top of the line full scale cannons can be found at...
http://www.florentine.com/cannonLTD/index2.html
http://www.wwd.net/steen
I volunteer to administer a cannon/reenactment/black powder forum!
Joe
[This message has been edited by nralife (edited June 19, 2000).]