Overdrive transmissions are listed on ebay, craigslist and local sources. You absolutely don't know what you are getting though,
you can pay a lot for junk or a little for a good one. I rebuild several a year and have found lately that most are very needy after they are disassembled.
For the overdrive to operate as the factory intended you need a pull cable and the electrical components which include the solenoid, governor, relay, kick down switch & brackets, and the wire loom.
You can also place a want ad in the swap meet on this forum.
Fred
