NOT GIVING UP !!!

I need to find another agent, because I don't think I want to deal with the one I found I need to put the people in a house before I lose the sale, I started looking for houses for sale by owners, and I found one that I believe they will like, contacted the owner and made an appointment to see him and the house tomorrow.
He's asking 150.000. Trying to do the math to see how much I can offer, (don't have any idea of what I'm doing, just ask the good Lord to help me. Any help from anybody ???? Please.