There are no costs for posting papers for groups who designate someone to fill out the submission forms and upload papers.
There is a small charge per paper for groups that have each author submit their own papers, or have staff at the University of Minnesota assist with the process. Charges are from 1 to 5 USD per paper depending on how much extra processing is involved, for example adding conference cover pages, or splitting journal issues into individual articles prior to uploading.
If your group has older papers that need to be digitized and uploaded, the coordinators can help you with that process, or arrange to have it done for a fee.
For more information contact the coordinators at aesearch@umn.edu.