[redpoint5]

Cameras can be had for as little as $5. I bet quality ones made for vehicle manufacturers can be had for $10. Mirrors aren't really cheaper, or at least close enough that the question isn't which saves me $1, but which solution works better most of the time.

Even if the cameras add more expense, they quickly recover that cost by way of better fuel efficiency. Cost isn't a hindrance to cameras anymore. If anything, they save money.