you can buy duck at most grocery stores. I have never done domestic duck, but I have done wild (I hunt) on the smoker and they are awesome! I have a recipe at home, I will try to remember to post it up. If I forget, please email me and I will get it on here. It has a soy/orange glaze that is top notch.
Fior everyone's info, if doing wild ducks on the smoker, make sure you start with GOOD ducks...there is a big difference in wild ducks' diets that factors heavily in the taste of the meat. Obviously, domestic ducks should all be good ducks.