Casita Fiberglass Trailers - US | Fiberglass RV's For Sale
Also read the various CasitaClub blogs and forums regularly.
There are always a good number of late model, pretty goood looking Casita's on the market, normally 17 footers. Just put in the work of searching and check almost every day. Mark these various sites with bookmarks in your browser. Over a 4 month period, many good buys surface, if you check the sources faithfully.
When something comes up, be prepared to act fast and travel a bit. The odds of finding what we want in a neighboring village isn't very high, to be honest. Hope all these tips help.
That's about all I can tell ya.