Cue light systems are most often used for rail cues or deck cues. If we've established that you have no flyspace and very little wing space, it seems unlikely that you'd be doing the scene shifts on the scale that would require cue lights. Is a cue light system really necessary?
As far as a camera, there are loads of options. If you're on a tight budget I'd recommend something like the two cameras below. They are in the "pro-sumer" range - not quite commercial grade so they are more affordable, but not your radio shack piece of garbage that will fall apart in two months.
If you absolutely need something day/night
this Elmo camera should be a viable option. I do not believe this is actually IR as these cameras get more expensive.
This other Elmo camera has better zoom range and is a higher resolution but is not a day/night camera.