They also sell down to $60. He just got one of the most expensive ones.
Actually, I think the difference is more for anyone who is on any kind of screen (TV, computer, laptop, xbox, whatever) for more than 2, 3 hours a day. The Gunnars really lower your eyestrain, and at least $60 is totally worth the long-term effects you'll get from easing that eyestrain. Personally, I'm getting a pair of prescriptions, just waiting for them to come in :)
Gunnar Optiks - Products - There's the one I'm getting
Gunnar Optiks - Products - And those aviators are sweet :P