HID Xenon light flickering

[Dr. X5]

Hey, i just tried changing my xenon bulb that was out.... when i put the new bulb in it started flickering... i noticed that around the red piece that holds the bulb there looks to have been something burned or some corrosion around it. i used multiple different bulbs and they all flickered, so its not the bulb, im thinking its either the ballast or that bulb holder... first of all where can i buy the ballast at a good price? i know their expensive at the dealer... my other question is can i just replace the bulb holder? (i don't know what its called but its black and red and the bulb sits inside of it)

Thanks!