Might do some watching here http://www.fiberglassrv.com/forums/f53/
or at Molded Fiberglass Travel Trailers For Sale | Fiberglass RV's For Sale
If you have the time to browse the sold ones you can get a better idea on a price/value point. You almost always have to be willing and able to jump fast when you see something, they get sold quick if the price is at all reasonable. Be prepared to go look, buy and drive home.
Campers from Scamp
are all potential candidates, Casita
are currently manufactured (Texas & Minn.) so a bit more chance of picking up a newer model here in the states. Not sure if Boler
and Trills are both still being made. Pretty sure at least Trillium
of course are long out of production but very interesting and solid construction. Egg Campers are pretty scarce but a nice rig, not sure if they are still in production or what. Know they had some sort of issue for awhile, at least according to the web site.
These are the ones I can think of you might browse for to get an idea of what is out there and at what price. You did not say what size but these are the brands I know have a 13 ft. model at 15 and 17 some other FGRV brands might be a possibility.
Good luck and despite having to act quickly be careful to avoid the scammers, people that need $$$ up front for odd reasons. Nothing wrong with you sending a small deposit to hold the camper but there are some scams out there, Craigs list is sort of noted for it.