I need to change the timing beltl, water pump and drive belts on a 4WD
Rav4 (1997) ... I am getting quotes of around 750$ + tax ... is this
reasonable? The last time I did this, I thought it was a lot cheaper
....

Rav4s are very tight to work on, and if your model has ABS, you can expect
to pay more. The ABS actuator is right where your two arms would be while
working on the front of the engine. It's a real pain.