As stated above this is a highly customized process. This means that the price will vary greatly depending on your needs. A "basic"* version can be installed for around $500. More typicaly the price is roughly $3,000 for the Administara Script license and about another $2,000 for the basic* site layout and design. Obviously more complex designs and needs are more, and more "toned down" design slightly less. If you are interested in more "concrete" pricing you should provide us with the details of your project and we will provide you with a bid.
*: A note about "basic". We use the term basic to mean a very simple single page site, limited functionality of Adminisitara, and no significant customizations to Administara.