1. CASH
2. 30 or 50% down payment can make better deal for interest rate.
3. Contact with dealer as many as you can – more than 10 dealer.
4. Car Insurance will be more difficult one to you, it can be different 50% up to insurance company and broker. contact with more than 20 insurance companies and brokers.
– insurance when you drive with rent car?
– deductable?
5. check every one you can do and make every one as written form when you talk with car dealer.
6. You will see how sale man can be changed after you sign it.
7. longer negotiation time can save more money – at least 2 hours.
8. You can check several stories in this site about buying car