You bet we've done it. I love Turduckens (or however it is spelled).
A true turduckhen is, of course, a duck stuffed into a chicken stuffed into a turkey.
A few years ago Costco carried them during the holiday season; they were great!
Central Market carries them each year, if you have one close to you. Mind, I did not really care for their version, since it was really just a turkey that had been stuffed with lots of dirty rice, with bits and pieces of duck and chicken mixed in. The Costco version (frozen) was just meat (all boneless), with a core of duck (very dark meat) surrounded by the chicken surrounded by the turkey.
A year ago Krogers carried them (again, frozen); again, very good with just meat (again, boneless).