Michael from MuckRock sez,
It's difficult, but not impossible, to get info the old fashioned way from the NSA, using the Freedom of Information Act. Here's MuckRock's guide to getting as much as you can with as little hassle as possible, and a few requests to follow and play along with at home:
The good news? The NSA isn't the slowest agency to get info out of: It manages to be speedier than the FBI, the TSA and U.S Forest Service.