You will find that rate for the hire of the instructor and the plane, with all things being equal, are pretty much the same in a given area. What will differ in a quote are all the extra things on top of the tuition and flying time. Sometimes the quoted price may not be the total price inclusive of all the costs involved. In those cases you'll be in for a nasty shock.
One more thing. More important than money is the instructor. If like me you're flying a 152, prepare to get very cosy with the instructor. If you don't like the instructor its not going to work no matter how cheap the lessons are.