There are a lot of sites that sell preforeclosure and absentee lists because those aren't necessarily county-specific.If you still can't get it, then I would go on Upwork and find a virtual assistant to put the data in Excel format.

I've been looking through some PM sites and they all feel a bit shaky. 

You can research each town by going on the town site, look at their construction permits, what's going on in town in general, what are the plans for growth, etc.Best!

Run the address against the state tax website (treasurers website usually) and see if it comes up with owners info.

Are there any books, or sites, or webinars or anything out there about how to manage airbnb properties that anyone knows about?

If you need encouragement to take action come on this site .

It is on most sites.

Check the usual job posting sites (indeed, craigslist, etc.) and/or use google to make a list of brokerages and then make a pros and cons list for each. 

Copied this basic information from another site ...

My suspicion is that you are overpriced if your listing has quality pictures, marketing exposure on all of the “big” websites, and the overall condition is average or better.