If you want to get your PPL for cheap, get a job at CESSNA! Of course, that means you pretty much have to be an engineer. I had an internship down there in the summer of 2001 and was able to take advantage of their EMPLOYEE FLYING CLUB. You have to pay monthly dues but they are like 30 bucks a month or something stupid like that. Renting a NICE 172 cost $33/hr, talking a 1997 R model complete with Garmin GPS. Anyways, I figure I spent just over $2000 out of my pocket. THEN, Cessna decides to reimburse you for "educational expenses" when you solo, and then when you get your PPL.
Solo=$500
PPL=$1000
Of course they tax the crap out of this... so you get.
Solo~$350
PPL~$700
So all in all I figure I payed right around $1000 for my PPL. So if you're an engineer and you have time to do an internship...
GO WORK AT CESSNA!!!