Sometimes not even sold, but given. There are government programs where police departments can ask for used military gear and get it at no cost (i.e. no impact to their budget). This makes the departments especially eager to acquire as much "death tech" as they can.
> So you end up with towns of a thousand having swat teams and tanks and you wonder why the culture shifts from protecting and serving to war, death, and extortion.
This makes me very sad. I was born in the 70s so I grew up during the coldest part of the cold war. We were taught in school that (sorry to Godwin) Nazi Germany was pure evil, Stalinist Russia was pure evil, Italy under Mussolini was pure evil, China under Mao was pure evil, and so on. Yet here we are becoming just as militarized on a local level as those regimes, giving our police forces nearly carte blanche to oppress the citizens at will. It's disgusting and disturbing, and I say that as a former law enforcement employee of 14 years.