I had a client that wanted to restrict access to a shared network printer on two publicity accessible computers. The printer natively did not have built in password protection and the network was not domain based so setting up active directory security was not an option. A hardware print server was possible but not ideal. After much searching, the only fairly in-expensive option I could find was a product called Printlock. For the most part, it is fairly simple but did exactly what the client wanted. If someone hit the print button from the public computer, it would prompt you for a password which would be entered by a staff member. A great little product that fills a niche need.
