Simply replacing the board probably won't be enough. There is an 8-pin serial EEPROM chip that needs to be transplanted from patient to donor. This chip contains unique drive specific information.
If you need to purchase a PCB, try the following vendor:
http://www.onepcbsolution.com/His price is US$40, plus $10 for a ROM transfer, if required.
Otherwise, upload a detailed photo of your PCB and one of us will help you with a DIY repair, if feasible.
When you say that your drive is "not functioning", does it spin up or attempt to spin up? If so, then the problem will usually not be PCB related.
BTW, I am not associated with any supplier.