You have a couple options. (I'm assuming you meant SPEED CAMERA alerts)
1) Subscribe to TomTom's Speed Camera alerts
2) You may want to consider the following option:
>>> GPS World Safety Camera Database <<<
3)You can also do a very similar thing by setting up POIs that are the location of the cameras with a POI warning with maybe a 50 ft or more warning distance....
Maybe this will work for you:
>>> Download Safety POIs HERE <<<<
There is a ONE-time lifetime registration fee of US $7 for SOME of the more inclusive POIs on the site...