Normally for in-house insurance, they have discount under the
price list. For example, they quote u a discount of $2500 for
in-house insurance. If you do not want to purchase the in-house
insurance, then you got to pay additional $2500 for the car.
I recommend you to go for the in-house insurance for the first
year. then for second year, see if the company give any discount,
etc...
For me, I bought under Cycle & Carriage. They have in-house
insurance under AIG. Not bad, second year still give discount and
best of all, in case of accident, I go to C&C, which is one of
the authorised workshop.