I forgot what I was gonna write now.
Oh yeah. It depends on how deep you wanna dig into your pockets. You can get super white bulbs for $20 or $120. I am very big on quality, so I would advise that you be prepared to shell out about $70-80
If you look on the internet (try ebay if you dare) you can find some $120 bulbs for about $75. You just gotta wait a week for delivery. I got my PIAA Spark Blues (7500K) on the way, cost me $78 including S/H