$150 is the cheapest quote on froogle.com... It does seem to confirm that this equipment is too expensive for most people to have one, even if Technopolitical's diode wristwatch would be cheap enough. A smoke alarm [with a radioactive element in it!] will cost a few dollars/euros/pounds and many private homes have them, but people would't dish a couple hundred dollars/euros/pounds for a geiger counter [though I am told after chernobyl Ukrainians would go to the market with a geiger counter to weed out unsafe food, so it could become widespread].

guaranteed to evoke a violent reaction from police is to challenge their right to "define the situation." --- David Graeber citing Marc Cooper