There is no "SS" that small. This ship was all CG, other than the REALLY HUGE model from the movie.
There's the Big Damn Replica, which is what it says on the box. It's I guess the 19" one you mentioned. (Dang, I thought that thing was supposed to be over 3 feet at some point?)
There is also a quite large - 3 foot-ish - fibreglass kit from a guy called Ron Shanko. Unfortunately there was some drama, in which I'm sorry to say I played a small part. He can't be found around here any more; I know he sold some kits over on SM, don't know if he can still be found there.
If you track one down, study good pictures of it before you buy. Some owners are very happy with theirs but the mastering does not meet everyone's expectations. It may not be your cup of tea.
There are also a couple of nice paper models around the web here and there.