If you have an interest in reviewing the agreements libraries negotiate with publishers you might want to take a look at small collection of these documents that Iowa State University Library makes available via the ISU Digital Repository. Each of these documents include some pricing information.
Here’s what’s currently available in the collection:
Association of Computing Machinery 2020 Iowa State OA FINAL ||| PDF
Association for Computing Machinery and Iowa State University
Cambridge University Press 2020 Iowa State OA FINAL ||| PDF
Cambridge University Press and Iowa State University of Science and Technology
Elsevier Compendex 2020-2023 Iowa State Subscription FINAL ||| PDF
Iowa State University of Science and Technology and Elsevier B.V.
Elsevier Journals 2020 Iowa State Subscription FINAL ||| PDF
Iowa State University of Science and Technology and Elsevier B.V.
Oxford University Press 2020 Iowa State OA FINAL ||| PDF
Oxford University Press and Iowa State University
Public Library of Science (PLoS) 2020 Iowa State OA Final ||| PDF
PLoS and Iowa State University
From 2019
American Physiological Society 2020 Iowa State OA FINAL ||| PDF
The American Physiological Society and Iowa State University