new housings, new projectors, new bulbs, and new ballasts definitely costs a lot. unless youre using knockoff chinese HID stuff, which probably isnt worth the time, effort, and even the first couple hundred bucks to make.
well i take that back - most of the people who want projectors on here dont want to chance something going bad on them. you can do whatever, but if you do use cheap ebay stuff, let me know how it goes because id definitely consider it... id love projectors but ust dont have the money for OEM quality stuff