I just bought a set myself and I'm not trying to take up for this seller at all but.... he is including two ballasts and two original bulbs which will sell on ebay and then you'll end up paying probably less than $300 for the housings. I personally wouldn't want the original ballasts and bulbs but there are people out there that do. Aftermarket HID's are brighter and better and if a bulb goes bad, you're looking at $15 or so, not $100
I do have to say that better pics could have been taken. $500 on ebay I doubt will ever happen. Just ask Sonny. He'll tell you how much their worth seeing how he just about bought up every set there ever was on ebay from 2004 till 2008 and some went for $800 and some went for $1300 but the majority sold to him for right at $1000.00 for the pair, with bulbs and ballasts.
I'm not saying what I paid for mine from Mike because he might not want that out there but they are housings only, just like I wanted and DLF will get another $50 or so out of me for rings and I'm buying 9006 Phillips 6000K bulbs for the lows and using my current 9005 6000K's in the highs.
$500 sounds like a lot but if you get them and sell the bulbs alone, you'll get right at $100 or more from each one. Sometimes you have to play a game to get something at the cost you want it for. I would certainly want to see better pics than this because if ebay are getting the same, they ain't selling there.
I think the seller here should consider selling the bulbs himself on ebay for $100 each and sell the ballasts separately also on ebay and then put the housings on here for us Mark VIII fans for around the $300 range and go from there. JMO