Ebay has lots of advantages, but as a marketplace for big, heavy things that are difficult/expensive to ship, it fails miserably.
And it is still the case that the supply of used enlargers is large, and therefore the price that they command is small, and as a result new, reasonably priced enlargers are not likely to appear.
One of the problems with the current situation is that availability is geographically inconsistent - and when it is hard to get something shipped, that means use is geographically inconsistent.
Another problem is that people who have unused equipment in storage are less likely to put them up for local sale on Craigslist or Facebook marketplace or other internet based media than younger, more internet focused people might be. That problem tends to resolve itself when there is a local community of users - if one becomes known as a darkroom fan, it is surprising how many people ask you about their unused stuff - but until you find such a community, it is difficult to benefit from it.
My biggest advice to people like
@dcy is to look for local people who are interested. They may not all be as knowledgeable about technical stuff as some of us here, but they are likely to be considerably more knowledgeable about things like local sources for things and experiences.
If you haven't already done so, gravitate to the artists in your community. While someone you speak with may not be involved with photography themselves, they may very well know others who are, including sources for materials.
For example, if their are independent artist supply stores in your community, they may very well supply photographers - even if all they sell them is mats and frames. And they therefore may have people they can refer you to.
The same applies to learning institutions. Their art departments often have photographic contents. In addition, they may have photography technicians who will undoubtedly be working with digital, but that doesn't mean they aren't either interested in film for their own work, or formerly involved with film, or know of other contacts who can help.
And as you know, if you find some stuff locally you are considering, there are lots here that are happy to supply whatever advice we can through the internet.