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I bought mine from a member here. If your have the time shop around
here and on that auction site. Major vendors also cary them but they can be had cheeper.
Bob
BTW this is an awesome upgrade, just watch your bulb wattage with stock wiring
One issue very few people look into is the wiring up to the bulbs. C4's have crappy wiring. Upgrade to better wiring and with the Hella glass housing upgrade and new bulbs, you will be able to drive with out overdriving your headlights.
Daniel Stern lighting sells a kit and is very helpful in working with you.
Another thing to think of, is when you go to a heavier headlight, is your headlight gears should be upgraded to bronze gears for the extra weight. http://www.danielsternlighting.com/