It all depends on the purpose of your search. If you're concern is organic that is easier. If it's humane treatment then it's more difficult to find.
I spent some time on the phone the last couple of days calling turkey farms to find out how they "process" their turkeys. To sell meat, it has become the fashion to say "humanely raised". But if you ask specifically how the slaughtering is handled they will tell you.
The only company I have found so far that is truly humane from beginning to end is Mary's Turkeys owned by Pitman Farms. They have organic and non organic.
Even PETA says it is humanely handled and that's a shocker to me because I would assume that they wouldn't think anything involving the death of an animal was humane.
You can buy them at whole foods and at QFC but they are uncooked. The Diestel turkeys that you can get cooked from whole foods are humanely raised but not humanely slaughtered (in my opinion) although certainly more humane then regular big processing plant turkeys. Obviously it depends on what your looking for. If the last 5 to 10 minutes of their lives is an issue for you, get Mary's (Pitman's)