WSU is a supporter member of BioMed Central, This provides authors a 15% discount on the article processing charge. When submitting a manuscript confirm that WSU has a membership when the publication system prompts. They will usually get back to you in a day with the charges (minus the 15% discount). Washington State University does not have an open access fund; you are responsible for paying the discounted price. For more information please see, https://www.biomedcentral.com/about/institutional-support/membership.
Please see the BMC submission guide: Submission Guidelines for authors requesting a membership discount with BMC