legal yes. cheap, not very.
Radar JAMMERS are 50 state ILLEGAL, they violate the terms set by the FCC. and are a felony to possess.
linked from Police Speed Enforcement Tactics in New York
New York Radar and Laser Jammer laws
Radar laser detectors and laser jammers are legal to own and operate in passenger vehicles in the state of New York.
Currently the only state that it is illegal to operate a radar detector is Virginia and Washington D.C.
Laser jammers are illegal to operate in the states of: Nebraska, Minnesota, Utah, California, Oklahoma, Virginia, Colorado and Washington DC.
Radar jammers are illegal to own and/or operate in all 50 states per the Federal Communications Commission.
Radar detectors are also illegal in commercial vehicles weighing over 10,000 pounds in all fifty states, per Title 49 Transportation Act.
Radar detectors are also illegal to operate on any military base.
If you are in the market for a high quality radar detector, we would recommend that you check out Radar Roy’s testing reports here .