Thanks I might try that! My impression of donation pages is the conversion rate is extremely low but it will be easy to add nonetheless. I might get better results with offering something in return, like Patreon (not sure what kind of patron content I want to regularly produce though) or products.

There is a much larger database of small ads that I am not publishing on the site, mostly because they add a lot of clutter. But to a researcher they may be valuable. Eventually I want to make the backend database available to people like your husband. Something like newspapers.com makes a lot of sense, thanks for the idea!