what brand equipment are you thinking abut having installed ?
vortexradar.
https://www.vortexradar.com/best-laser-jammer-reviews/. Excellent info
I'm not sure Laser Jammers are illegal in all 50 states - vortex says the jammers are illegal in 10 states.
you can contact VortexRadar and for a small fee determine if the pricing you were given is proper or out of line.
Also, a simple radar detector is a great defense, something like a Uniden R7 or R1. Laser detection is probably more important if your doing twenty miles-per-hour faster then the other traffic in the interstate. If your not speeding in built up areas then you eliminate to some degree local cops running laser.
Most important before spending any serious money for detectors ($700+) hold off and wait and see if the upcoming Radenso Theia is solid or vapor ware.