How much per/hr depends where you go and what airplane you use. Big cities using new airplanes=more.

Most schools break it down to 20 hrs dual instruction, 10 hrs cross country, 10 hrs solo. You should figure 30 hrs dual. If you can get into the Civil Air Patrol, you may have access to cheaper planes and instruction at a military flight club. Since 9/11, I don't know if it's still the case. If you live somewhere with good weather and a good availability of planes and instructors, you could complete a PPL over the summer. But what then? The worst thing you could do would be to get a PPL and then not fly for several months. You'd have to spend money getting checked out again if you wanted to fly, that would be about 2 hrs dual, and 1 hr ground most likely. Also, don't forget the cost of renter's insurance.

If you enlisted in the military, you could qualify for tuition assistance for college and you could avail yourself of military flying clubs. Of course, you may be ordered to risk your life for the privilege, or you may do it without your knowledge like the vets who were exposed to radiation and deadly chemicals.