A great outlet for skulls you cannot sell is schools. I donate lots of animals skulls to schools. Kids are fascinated with skulls, so it's a great way to get them interested in science and wildlife. The best way to find teachers who are interested in skulls is through networking, starting with your kids' teachers, or ask your customers to ask their kids' teachers. If you want to go a more formal route you could contact representatives of the Tennessee Science Teachers Association:
http://tnsta.com/Contact_TSTA.phpNot all teachers will be interested. A few will be anti-hunting, some will think it's gross, but many will jump at the chance to have animals skulls for their classrooms.