I imagine you searched in listings like this one...?: https://journalsearches.com/free-journals.php?id=Ecology
The result can vary greatly depending on your expectations regarding, for instance, the IF of the journal you aspire to. But don't forget that you also have waiver options. If there is a journal that you like but it is expensive, try writing directly to the Ed-In-Chief, tell him/her why you think your ms is appropriate and attractive for that journal and ask if there is the possibility of an exception to the payment considering that the authors do not have funds available at the moment. Having said that, if money is not your problem, but rather you are choosing Open Access for ethical reasons, I suggest you keep searching for listings that include journals with the correct scope.