military and service members received them for free. they were probably around $10 USD. they were mass produced to be cheap and so they are.
Yes
Well, I think that it was compulsory for men woman and children (in the army or not) to carry gas masks at all times, just in case there was a gas attack.
In what terms? Money? Casualty? Damage? If we are looking at aftermath, than it is priceless
Adjusted for inflation, $1 of bonds then is worth $11 now.
How the Phony War Turned into All Out War in World War 2
A Shift in the Tides of War in World War 2
The First World War as Fuel for the Second War
Opposition in the US to Enter World War 2