Turkey for American Thanksgiving in Stuttgart?

Hi,
My name is Moritz. I am a 19 year old American who came to Germany last year to begin my studies at the DHBW here in Stuttgart. This year I would like to celebrate Thanksgiving with some of my friends. For those who don't know it it is a harvest feast that celebrates that the British settlers survived their first year in America. The centerpiece of any thanksgiving dinner is a baked turkey. I need advice on where i can procure a turkey. I have only ever seen turkey breast in the supermarket and never a whole turkey. I would be really grateful if I could get some advice.
Thank you!