Any company owned Radio Shack store (not a franchise store, but a company owned one) should be able to order it through their RSU system. You may need to find a store manager to get someone that knows how to access they system using their POS computer though. Look through this thread for some of the pitfalls you may have finding somebody to help you though --> http://forums.radioreference.com/ra...032-rs-dont-carry-parts-anymore-pro-96-a.html
Doug, KC5EIB, might be able to help you if you have any questions. He's active on this site and a RS employee.
What makes you feel that the entire board is bad?
Many just suffer from a connection failure from the BNC antenna jack to the board. That is an easy fix but the rest of the RF board is still fine.