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Not enough information there to give more specific ideas than that ... what transmission do you have? Are you looking for a gear or a transmission? What exactly is your question? Do you want to know who sells parts, or what transmission rebuilders are trustworthy or what donor vehicles in a junkyard might have the same transmission in them or ... ?
What part broke exactly? Have you opened it up to inspect the internals? If fixed yoke, I have an entire mainshaft with all of the gears and syncros installed on it laying around I'd sell for fairly cheap. I decided to go with a slip yoke/long tailshaft is why I didn't use it.