There are at least three different builders that used those molds, I believe Sandtana was the second one. I inspected one for a Toyhome buyer about 3 yeasr ago here in Riverside. They have about the same room inside as the 13' eggs.
That price is waaaay high, esp for this late in the season. The one I looked at in Riverside was at least a 7 out of 10 and was $3500.
But, have you seen this one????? 1989 Sunrader Adventure II Photos by advocateone | Photobucket
I restored and sold it almost 2 years ago for a bit over $10k