I purchased the below from ebay. 2 sets cost $190 shipped with the anti flicker harness. The ballast are very small and are plug and play. I even have to switch polarity like some kits. I have not had a single flicke issue for over a month now. Make you tell the seller there for a 300c to get the anti flicker harness. He will send one for the lows and fogs, since you don't need them for the fogs keep them as sparea or sell them. To get the discount for the 2 pairs just send him a message for combined shippin for 2 sets.
eBay Motors: H1/H3/H4/H7/H11/9005/9006/9007 HID CONVERSION KIT XENON (item 130198889788 end time Feb-23-08 10:16:39 PST)