I am trying to find vendor information for the electronic journal, JAMA
It sounds as if you are looking for this information by going through the "our journals list" link on the library's Web page. The table of contents link on the extreme right is really designed for an alerting service and does not open to the actual article. However, the answer to your question is on the same screen as the table of contents. It is right under the title and says "Publisher." We subscribe to the journal directly through the AMA. As a matter of fact we get a package of AMA journals along with JAMA.
Let us know if you need more information.
Coordinator of Electronic Resources