I have quite a few spare parts for the 97 - 2003 years. They all came off a 2000 GTP. Most will work on either GT or GTP. All parts were working when taken off, may just need to be cleaned up a bit.
Gen 3 M90 Supercharger (Rotors are good, spins smoothly) - $100
L67 Series 2 Lower Intake (Dirty but in good shape) - $25
Alternator - $45
Starter - $30
Radio unit - $15
x2 Front door speakers (Bose | 5 1/4) - $30
Only the alternator is year specific. It won't fit 97 or 98 GT/GTPs.