Dear biologists,
Maybe you follow the university news better than me, but I fear that many of you did not notice this:
https://patio.oulu.fi/fi/uutiset/kustantajien-open-access-etuja
English:
https://patio.oulu.fi/en/news/discounts-open-access-fees
In short, Oulu university has done an agreement with several major publishers (Elsevier, Springer, now also Wiley) about the discounts for open access publishing. In many cases there won't be a fee at all.
Best regards,
Marko M.