Hello I am interested in the bike you have listed for sale...
Ok. I am asking $149 because of the condition of the bike. It's in excellent shape!
That is still a bit high for a used bike and I can't really afford it for a new one. I also see the tire is cracked and that will have to be replaced.  Would you be able to come down on the price at all? If you could lower it I could come pick it up right away and pay cash.
The cracks in the tire are small. And I'm also including some accessories that I added, such as the bike seat. I understand the price may seem high, but I assure you it's worth it. I would be willing to negotiate a little since you offered to pick it up immediately and pay cash.  What is your budget for this item? Would $120 interest you?