Where the big bucks are ...
The NRO (the existence of which was officially denied for decades) basically puts up a Hubble every year, just looking down instead of up. The KH-11 series were said to each cost the same as a Nimitz-class carrier - $6bn - while Hubble came in under that amount.
I'm a complete supporter of military funding, but I really wish the US would divert just 5% of it's defence expenditure to NASA and space exploration. The results would be amazing.