Originally Posted by Rangernator
It depends how bright you want them 6k is probably the cheapest it has a blueish whiteish hue to em then its 8k thats more of darker blue then 10ks purple there are brighter ones but they are illegal.
usually 6k hids go for about $110-$120, 8k go for$160-$180, and 10k about $200
HID kits usually go for around $30, and the color of the bulbs usually have no affect on the price.
is an extremely popular HID seller. They periodically have sales on their kits (around the holidays & etc.) where they price the kits at $25.
eBay is another source for inexpensive HIDs.
Almost everyone who does research runs with eBay or DDM tuning HID kits.