Finding replacement circuit boards for HDD

Yes, I know, I know, it's a daunting task, could lose all data, etc. I'm well aware of the dangers involved. The data is not THAT important. Much of it can't be replaced, but it's stuff I haven't accessed forever. If I can get it back, fine. If not, no biggie. Here are the facts, as I know them:
The drive I,m trying to salvage is a Seagate, (I know, first mistake). I have all the particulars right down to the numbers on the board itself. My problem is I can't find any place to beg/borrow/steal one. If anyone can steer me toward someone who can help me, I'd be eternally grateful.
Frustrated In Wyoming,
Jet Montana