You do have to replace them with a HID, (you can't replace them with a Halogen bulb - so those $5-$30 bulbs are no good for you) Try eBay if you want to buy cheaper bulbs, they won't be made by Sylvania though, so the quality is questionable, but the price will probably still be around $120, just for 2 bulbs instead of one, haven't really seen anyone on eBay selling single bulbs. Usually people replace them in pairs anyways, but you don't have to. Those OEM HID bulbs are just expensive, so you might just have to pay that $120 and keep on driving.
But if you look at it another way, its not so bad....If you've never changed the lightbulb before (which i'm assuming you haven't) it lasted you 5 years...way more than a halogen bulb would be expected to last.
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