I've been trying to find out how much these cost so I could do the math and pitch it to my city council (they only care about money these days), but not a single manufacturer has pricing and none of the 4 that I emailed have replied in a month.

I live right next to a very high-traffic road, but I got used to the noise. What I can never get used to is the dozens of idiots on motorcycles and modded cars with removed mufflers that drive by in the dead of night at twice the speed limit.