Yes, I was about to post about the price on these bulbs as well, but Cadchris beat me to it.
A month ago these were going for about $50/pair. The price has been steadily dropping since then.
FWIW, I've been running a Nighthawk Xenon on my motorcycle for the past few months. It currently has about 260 hours on the low beam. I haven't been able to find the Tc and B3 values for this bulb, does anyone have this data on hand? I will probably replace it soon - don't want it to suddenly fail on me at night (single bulb headlamp).