I think this might have been on here before.
One of the sales associates at my work was interested in it, I think they were looking for $300 to $500, but compared to most License cameras that isn't bad.
You can find the website in google with the words speed bump cam.
We haven't purchased one for testing because of the functionality and our location. We don't have a good bottle up for cars or a way to wirelessly, or use underground cable, to get it hooked up.
I do like their solution to the glare problem from the head lights, since the position puts it in a place where the headlights just aren't hitting it.
It is also some thing that could probably be made cheaply with existing materials.