Diane, Both the Oliver and the Escape will be hard to find (not impossible) used. You might come across one, but most likely it will not be in your area. I know there are some Oliver owners in AZ, TX,. Escape owners you probably could get a list thru Escape themselfs.
But I would suggest that you try and make the Oregon Gathering
Oregon Gathering info You will be able to tour all kinds of glass options there. I know there are a few Oliver owners who attended in the past and I am sure there are Escape owners who go. Plus all the other options to explore. You don't have to own a trailer to go there is the town of Bandon near by as well as the park has Yurts to rent. Just thinking it will give you a great opportunity to see a few for yourself.