I tried bifocals, and they are just not for me. I work on a computer all day, and having to jog my head around in order to have appropriate focus sucks.

So ... when I go to get an eye exam, I have them give me two prescriptions. One for distance (driving, movies, whatever), and another for about six inches past arm's length - how far away my main monitor is. Then I get two pair of glasses online for ~$40 each, and a pair of distance sunglasses for $50.

I like the distance sunglasses better than transitions lenses, because they're darker than the transitions would ever get. Adding other fancy coatings will certainly increase the price of the lenses, but I think I only did scratch resistant on my regular distance pair, since I'm not doing somersaults while on the computer.