The NBA does not keep a data base of individual transcribers for the purpose of making recommendations for service. That would make sense as the organization's purpose is to provide continuing education to all those who prepare braille. I do not know if I can ethically answer your question in this forum.
However, if you post your need in the Private: Message Board found in the Forum listing of Ask an Expert, interested transcribers can respond to your request directly. If you receive no response, feel free to contact me outside the two forums at email@example.com. I, of course, have limited contacts whereas the NBA's Private: Message Board is accessible to a wide range of transcribers both inside and outside the US.