HID xenon replacement bulbs

anyone know the best place to obtain these on the cheap? Autozone wants $99.00 for a single bulb!!! I've looked on ebay, and found ones for around $15 + $10 shipping... and I'm sure they are a no-name chinese knock off, that'll blow out in 10 minutes...

I am kind of a cheapskate, and do most of the work on my vehicles myself, but I have NO CLUE how to replace the HID bulbs in this car.. anyone know of a guide, or some pics of doing this?