I'm just learning about HID Kits and never knew much (and still don't) about them. I am going to get a few things from Tonemonday and I saw a HID kit for about $500. When I looked online I found (http://search.ebay.com/H4-35W-12V-HI...C0021QQxpufuZx)

where the price is much less. Does anyone know the difference or is there any difference in quality?

If it were a few dollars difference I wouldn't even ask but I've seen a few for $125 or so which is a huge difference and just wanted to know why. Again I'm learning so any input would be appreciated on HIDs.

Thanks