S*P*A*M (The Society of Properties Artisan Managers) is a group of theatrical prop managers, directors, and educators throughout the United States. If there is a larger prop shop in a regional, non-profit, or university theater, chances are the prop master is a member of S*P*A*M.
Over the weekend, they relaunched their S*P*A*M website to include a lot of useful information about who they are and what they do. Readers of this site will be familiar with the Properties Director Handbook, which was written by Sandra Strawn (a member of S*P*A*M) and includes information and photographs from a variety of other S*P*A*M members. The PropPeople discussion forum is another resource that was initially set up by S*P*A*M members. And of course, yours truly is a member.
Of greatest interest for now is the list of props internships they provide. If you were interested in learning how to work in props through an internship, this is where you will find a shop. While there may be other companies who offer internships, you run the risk of working somewhere that uses interns as free labor and impart no educational value; working long hours for little pay in a theatrical setting is not the same as learning a craft. In addition, the companies in this list are the companies that are recognized throughout the country and will help you with future employment.