Well, you basically only have two choices. AngeliBrights @approx. $300 (Best & Brightest and seem very good quality - not to mention made in the USA) or ebay kind which is around $50.

See my comparison of both here and decide for yourself:

X5world - View Single Post - Any one with experience with this HID Kit ...

And it was nice to meet you too. Even if you made me freeze (even with a jacket) while you were standing there with no jacket. Kinda like a polar bear in his element and was thinking "what seems to be the problem here?".