That charge for them to do it is crazy. It shouldn't be much over $200, under at some places just for belt change. Though yeah, it's a good idea to get pulleys,h2o pump, and tensioner done at same time. And those prices for the parts are fine.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15