Who Makes The Rockets

I've been wondering who is supplying Hamas with rockets. My thought was, why doesn't Israel and the USA simply offer the suppliers a lot more money and in this way derail the entire supply chain. In my opinion that would be well spent tax dollars. Turns out Hamas is now manufacturing it's own weapons.

Reuters: Analysis-Hamas homemade rocket industry bypasses crumbling supply lines

"(The armed groups) have unveiled new rockets and launchers that they have made themselves: a development that makes the militants less dependent on rockets that are smuggled into the Gaza Strip to threaten Israel's main population centres," according to Jane's Intelligence, a London-based consultancy.