03 Vue here.
I've replaced about half the parts so far, or at least it feels that way! Thermostat twice, gas line, front calipers at different times, battery, and some other parts I can't remember names of.
I never have problems getting parts- like another poster said, Chevy carries them. I think many of my problems relate to being a city car, rough streets potholes and stop and go traffic are part of everyday driving.
All in all, I love my Saturn. I'll probably keep it until I run it into the ground, then I'll cry over losing it.