I've seen the Duca's hull in person. It's not fiberglass, but still a nicely done hull with no flaws as far as I can tell. I haven't had the experience cutting one yet but I'm sure ship crazy and others can chime in. The Duca hull at Strike is $20, so it's definitely worth a look if it's still available.
I really hate the look of the Duca. Are there anything else? Used hulls, again, are fine. They just have to be glass and under 75