hi lowk, i think many of the gang here uses it. if i am not mistaken, it is a H4 bulb. price wise, no diff from the normal HID for your normal headlamp and i think you can get it done almost anywhere.
Bro YellowHat..U need to buy the whole set coz u will need the ballast to start and light up the lamp.
U can just buy the lamp provided u have the ballast and cables and other accessories needed.
It is not like a normal halogen lamp where it is just plug and play...