1. Reference
www.autotrader.ca if in Ontario for prices. There are about 100 year 2000's for sale.
Below is an example. This unit is a private sale, full tint with bug deflector which usually indicates an owner that has some respect for the vehicle.
Year: 2000
Make: PONTIAC
Model: MONTANA
Model Detail: EXTENDED
Price: $7,250
Mileage: 145,000 km
Date: 10/4/2005
Ad Type: Private
Comment: Auto, fully loaded, AC, CD, roof rack, alloys, fog lights, ABS, captain seats, silver, 2 sliding doors, new tires, cert. and e-test. 145,000 km, $7,250.
2. Place van in the Autotrader. I would start at $8500 certified if in good condition. You never mentioned the trim level.
3. You need a Safety Standards Certificate good for 36 days and the Ontario Government's Seller Package which will outline the PST payable.
4. Dealer is not a good option. Corner used car dealer might give you $4000.
BTW, between certain relatives there is no sales tax payable vis-a-vis your family purchase or gift.