How can buy a wireless signals jammer?
Of course, you can get a wireless jamming device. But, you can't get it in US. It is hard to buy this kind of equipment in the shop because of the policy. So there are other ways to get this kind of equipment in the United States. For example, China.
There are many online stores selling such device. You can buy a very good WiFi signal jammer in online shop. These stores usually have factories in China or Japan, and the quality is very good