Welcome! No need to worry about parts for the Grand Prix for a LONG time. Around here I see them ('97-'03) EVERYWHERE.

In your neck of the woods there is Ed Morad
Morad Parts Company - 3800 Motors, Transaxles, & Stock Parts
which is a salvage yard that specializes in GM W-Bodies. Prices are reasonable and the parts are warrantied.

Oh, and th price of parts and insurance was going to go up anyway.