speed camera reflectors

Hi guys,

Since this is the most multinational community in the world I was wondering if anyone knows where I can find these speed camera covers?

https://www.youtube.com/watch?v=vWkWxVbs4Xg

Also is there any good app that can see speed cameras but also see the speed radars of the policemen targeting your car and notify you in advance?

As you can imagine I got a speed ticket and I am pissed off...lol..

Thank you very much in advance!