Cameras
Well the key here is what does ... reasonably priced ... mean?
I've seen license plate cams that run as high as $12,000 and some at $2,000. Lots of claims made-- they look great on the demos-- but I've never used one so I can't comment on their performance.
I *have* recently upgraded my camera which attempts to capture license plates. It has been a big improvement compared to the previous camera, and I am still in the process of tweaking it. I am using a Bosch LTC0630 with a 7.5-50mm lens. Approx $600 for camera, lens, and mount. It captures almost everything really nicely during the day, but is not 100% at night.
Out of the box, it did much better than my old cam, but still had some issues at night, with lots of snow around, with a fast moving vehicle. Some of those plates I still cannot capture, but I have the percentage of non-capture fairly low right now. I was advised to change the shutter setting on the camera from its default of 1/60 to a new speed of 1/250 or even 1/500. I did make the change to 1/250 and it's yet another improvement-- again, not perfect but I am inching in that direction. Next trip to the wash I am going to config it at 1/500.
If you get the Bosch, also get the bilinx cable and software. With it, you can configure every parameter on the camera using a laptop while in the equipment room-- instead of being out in the elements or up on a ladder. The only thing you can't set with Bilinx is the zoom and focus.
Good luck on this ... some of it depends on how much you want to spend, and the other part is how much time you want to invest to monkey around with it.