well, i was thumbing through jcwhitless and saw these:

80-90 complete front wheel arch ...................... $89.95
80-90 outer front wheel arch ......................... $39.95
80-90 front door step panel .......................... $24.95
80-90 lower front doorskin ........................... $16.95
80-90 lower outer doorskin side cargo door ........... $21.95
80-90 lower inner doorskin side cargo door ........... $29.95
80-90 lower body side panel (driver side) ............ $39.95
80-90 full rear wheel arch ........................... $49.95
80-90 lower rear corner .............................. $12.95

now, i'm not really really keen on jc's quality, so it's up to you.
also check out:

Mill Supply                    "we carry panels for:
3241 Superior Avenue            Beetle, Bus, Dasher, Golf, Jetta,
Cleveland, OH 44114             Karmann Ghia, Quantum, Rabbit,Scirocco,
(216) 241-5072                  Type 3, VANAGON"
(800) 888-5072                  Free Brochure.
                                for 176-page catalog, send $4.00 ($5.00 CAN)
                                allow three weeks for delivery.

good luck.
joel