Hi Blazin, Although im relatively new to Audisport i happen to know quite a lot about HID systems (Comes with my work territory)
If it is your bulb (Which is more than likely concidering your bent alloy, assuming its was damaged by a bump) then you can get a replacment quite easily and cheaply. I would still check the fuses though as HID bulbs are relatively robust and manufacturers usually say that xenon bulbs should last the lifetime of the car.
...But there are some things you should take into concideration when you replace your bulb.
If you replace the bulb that has blown/been damaged with a brand new one, you will more than likely notice a slight colour difference between the bulbs. This is due to the way that Xenon bulb age. Your old bulb will be slightly more blue/white than the new one. If i were replacing a dud bulb in my own system, i would change both and keep the other an emergency spare, but as your selling the car its probably not worth it. You may want to try to find a second hand one on ebay if your concerned.
If you were keeping the car this would be more of a problem although a potential buyer (how knows what their looking at) my notice.
Replacing the bulb can be quite dangerous and I recommend you do a little bit of reading into the subject before you do it. The system uses high voltages to work, particularly when the system first starts up from cold! therefore...Take care!
Another peice of advice is not to touch the bulbs glass capsule with your bare fingers as oils from your skin will reduce the lifespan of the bulb (conciderably!).
A quick search throws up the following results as potential replacments:
http://www.hids4u.co.uk/d2s-bulbs-c-23.htm
Hope this helps, and im sorry to hear about your current situation. Im sure with time things will improve!