Rudders come up on eBay all the time.
There are several types:
Oldest are made of ABS plastic. They get brittle over time. They yellow in the sun. This is probably what you have.
Next oldest are made of Lexan. Durable as hell, but heavy and flexible. Flex=bad. They are a milky white, but they too turn yellow in the sun.
Then came EPO's - epoxy fiberglass with a foam core. Very light, very stiff. Black with an "EPO" sticker by the upper casting. Highly desirable, they haven't been made in nearly 20 years. Most are beginning to show their age.
Racer rudders - polyester fiberglass. As stiff as EPO's, but the finish wasn't as hard. Available in black and white.
PCG Plastic - black, similar to Lexan. Heavy and flexible.
EPO2's - a new take on the original EPO. Carbon/Epoxy, Carbon/Kevlar/Epoxy or Polyester/Fiberglass. Light, stiff and expensive ($250 each).
Along the way, there have been a number of aftermarket rudder mfg. Most are polyester fiberglass, but I hear there's a guy in Brazil that's still making wooden rudders that are absolute works of art.
Bottom line: you should be able to replace your rudder for less than $75.
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