As I posted in
this thread, Resin Realities produced a kit called Brody's Last Stand:
A mixed-media kit (resin, wood, and twine), the likeness to Roy Scheider is nearly perfect. As you can see, the shark is a bit off, but the shark alone is about the size of a soda can. These occasionally pop up on Evilbay, but they're getting harder to find as the kit is long out of production. And no, that's not my build-up.
Resin Realities also produced a kit of Quint's final moments:
According to the proprietor of Resin Realities (who posted that photo on The Clubhouse forum) the Quint figure was approximately 1/8 scale and the likeness to Robert Shaw was fair, but the shark was out of scale and the shark's fin was too close to it's head. Also long out of production, at this point this kit is nearly impossible to find; even the aforementioned proprietor doesn't have one.