Whenever you have a choice, buy a whole chicken then cut it up. You'll save money, and you'll get all the parts--this means better, cheaper, more nutritious chicken stock free with purchase of every chicken. The link above will take you to a video showing you exactly how to do it. The video is less than 4 minutes long and once you know how to do it, it will only take you 2 minutes to get the job done.
HINT: you need the good knife and cutting board I mentioned in my post about wedding gifts. :)