Probably Flybar. They're the biggest company.
Pogo sticks can be purchased online or at your local store, such as Walmart. Check out http://pogostickreviews.net/ for reviews and links to online pogo sticks.
Yes, of course :)
No
It depends on who is using it, as well as how well the pogo sticks condition is.
It depends on the boy.
No
as you jump on the Pogo stick you press down on a spring at the bottom. Then the spring propels you back upwards .
1 and a half
1and a half
about 5oo million
5