b2 bomber cost

https://en.wikipedia.org/wiki/Northrop_Grumman_B-2_Spirit
https://boards.straightdope.com/sdmb/showthread.php?t=216973
https://en.wikipedia.org/wiki/Military_budget_of_the_United_States
https://www.quora.com/Why-is-the-B-2-so-expensive-And-for-what-exactly-is-it-used
https://www.weforum.org/agenda/2017/03/the-us-spends-more-on-defence-than-all-of-these-countries-combined/
http://nationalinterest.org/blog/the-buzz/the-5-best-5-worst-fighter-aircraft-all-time-17690
http://www.cleveland.com/nation/index.ssf/2010/06/b-2_stealth_bombers_require_60.html