Want to 3D print a person? Need a 3D body model to put your head on? Go no further than Bodyworks - an online store specializing in sales of 3D models of people.
All of their products are SolidWorks models, suitable for modification for your own purposes. Prices range from USD$99-149 for body models and USD$249 for human hand models. According to Bodyworks:
BodyWorks is a SolidWorks native, adjustable human body model, for use in product design and ergonomic simulation. The BodyWorks model uses a unique joint system that allows for easy and precise adjustment of limbs into the position you desire.
If you want bodies, you might check them out.