Chev Joy parts should be easily available with chev motors there.
In karachi all parts are available from chev motors or plaza market.
Its a great little car. Cant say anything on the price. Price depends on condition mileage etc. Since you know the seller you must be knowing the condition of the car exactly.
If the car is not abused then there is no additional maintenance cost. Only oil, and filters change are required.
I am v satisfied with my chev exclusive 2005. Running trouble free for last 5 years.