There's nothing in your price range that I can think of you recommend to you. The Uniden R3 is a great little detector if you can afford it.
The Cobra DualPro 360 is also in the same price range and does great. $299 on Amazon currently.
Your car would need to be shaped a funky way to deflect radar away from the gun that's aimed at you. Radar absorbing paint helps some...but what you're asking sounds almost impossible. But I wish you luck regardless.
The good thing is that you can jam Lidar with the correct equipment. It's...
Has anyone tried plugging a Bluetooth transmitter into the audio jack of an R7? Wouldn't that make it possible to play the alerts on the speakers of your vehicle?
I'm talking about something like this: