You want to buy a second-hand car, but the price is too high. Write a letter to the owner offering to pay 10% less. If he accepts the lower price, you are prepared to pay cash.
Dear Sir, I have read your advert on the Internet saying that you are selling a used vehicle. I've been looking for an older, inexpensive car for a couple of weeks to give to my son. This will be his first car, and since he has only had his license for a month, I don't want to spend too much money on it. I looked at pictures of your car and it seems to be exactly what I'm looking for. However, I would like to arrange for a time we could meet so I can personally check the interior and exterior. Does it come with spare parts such as tires, motor, transmission, etc.? Also, I was wondering if I could get a 10% discount. If so, I can pay in cash at our meeting, after I've checked the car. Let me know what you think and when it would be possible for us to meet - the sooner the better, since my son has been borrowing my car recently... Regards, Jarda