Yes, military is most cost effective since it could bring potentially bring your cost to $0.00
The cheapest/fastest civilian way is to do Part 141 through a community college. That will get you your ratings and associates degree for around 70K. Then transfer into a 4 year school, ideally online, so you can flight instruct full time and take classes in between students, at night or on bad weather days.
You can get the bachelors degree and 1500 hours in around 4 years for less than 100K if you go about it aggressively