Here are some alternatives, just keep in mind, searching for things is A HARDER, SLOWER way to chattel, but give it a try if you find something with a huge supply.
Try Search Tempest for starters.
http://www.searchtempest.com/
I tested roomba on search tempest just now, tried different miles from zip code, it returned good results. Also by model, tried 980, latest, got two hits.
Many of these search engines have gone over the years, I guess notifinder isn't worth fixing.
So, if you are going to look for things, try searchtempest.
Gordon
And other tests using roomba980
https://www.extads.org/search.php?q=roomba980
http://www.onecraigs.com/craigslist-...038j2125284j10
http://www.dailylister.com/Search_Re...te&newwindow=1
http://www.statewidelist.com/custom....&as_occt=Title
http://www.adhuntr.com/p/results.htm...a=Search&m= 1
http://zoomthelist.com/index.php?q=r...e=ALL&u=Search
Now you have some options.