You never really know what you will find yourself in the need of when you are bidding projects. The latest museum project has me looking for farm animals and I came across this site: Butlers and Signs.
They carry life sized fiberglass and resin props. The prices seem fairly reasonable, though probably too high for theatrical props.
Some of what they carry includes Christmas and Santa themed items (great for those Santa visits), dinosaurs, mounted heads, cowboys, pirates, butlers, carousal horses, oversized food and lots of zoo and farm animals.