If you're a High School Student and disciplined, the cheapest/quickest way to getting your degree and most of your flight training for a low cost is:

1. Join the AF or Navy for 4 yrs
2. While your in complete as much college as you can for free. Right now you get 16 credit hours per year in TA. first year you're in eligible. so 3x16=48 credits completed. money spent $0.
3. Save some of the money you earned to pay for the last 12 credits to get your A.S. if its ERAU 12x$250(military rate per credit hour online)=$3000.
4. Get out of the Military Use the Post 9/11 G.I. Bill to go back to your school of choice, in this case ERAU and complete college and your flight training for Free.99 + you get a stipend and a housing allowance.
5. Start working as a CFI.

Total commitment 6-7 yrs (24 or 25 yrs old)
Total Cost: $3k + Books
Total Benefit: you are marketable, mostly debt-free, you're a veteran and have some life experience.

Again it takes someone who is focused, mature and disciplined to pull it off.