I think the flavors get a little "blurred" in a turducken - they tend to meld together during cooking so there is not a really destictive seperate Turkey, Duck and Chicken flavor for the most part ... IMHO ... if that is what you expecting - although I do like them!
I've had all of these turduckens (and his stuffed chickens which I absolutely LOVE) but the Cajun Style Turducken is my favorite - Tony Chachere's Turducken and Chicken page
. How can you help but love a turkey stuffed with duck breasts and a boneless chicken, stuffed with Cajun rice and crawfish dressing?
You might check your Wal-Mart Supercenter ... that's where I found these. But, they change what they stock depending on how things sell - so you might have to ask about getting them.