I always prefered to be honest about the price. I hated when I heard CFIs getting off a tangent when asked about the price, that'sjust wrong.
What you can do though, is tell them how much youguys charge per hour, how many hours minmum to get the rating (40 hrs for pvt), and how many hours does it realy normally take. Then you can do the sweet taking.
You can tell them that they don't have to pay the $4000 all at the same time, you can pay as you go, so if one week you are short on money, youdon't have to fly, however, the more often you fly the better, because it will take you less hours to finish the rating, that means it's cheaper.
Then you ask them if they would like to come by for an intro flight, it's only $60 and you'll have the chance to see what it's like for half an hour.
After you have the student, even if he/she is your only student, DON'T MILK THEM FOR HOURS OR MONEY, get them done as soos and cheap as possible, and your reputation wil take care of giving you more students.
Good luck!!