Turducken is a interesting dish which originated in Louisiana. It's a de-boned turkey stuffed with a de-boned duck stuffed with a de-boned chicken which in most of the ones I've had are stuffed with a seafood dressing.
A lot of people make their own (the de-boning is the hard part) but you can order them on line from a lot of places also. I'll post a couple of links but won't vouch for any of them.
www.turducken-king.com
www.cajunspecialtymeats.com
www.cajungrocer.com
This site also has some good information:
http://whatscookingamerica.net/Poultry/Turducken.htm