If you are prepared to shop around, some dealers offer specials on that job.
The standard price is around $300 labour. Altho I dont know what the hours
for the job are. In Oz, the industry regulating body specifies hours for
most jobs on cars and their make, and the list is available to the public.

If your car is leaving engine oil on the ground over-night, its good
practice to get the seals done and the water-pump if its done a lot of miles
*and* the car has not had proper coolant maintenance,..other wise they have
to do the same job all over again.

With my '96, I paid best part of $800 (at a dealer) for the
belt/seals/oil-pump. The seals were rock-hard on mine and had damaged the
oil-pump shaft. The $170 oil-pump is driven off the same belt.

I know it sounds like a lot of money, but once its done, the car will be
fine for years provided oil and coolant is changed as per handbook. Do shop
around tho.

Jason