EagleWill via eBay offers this HID 55-watt Xenon Headlight Conversion Kit with prices starting from $8.99 with free shipping. That's tied with our December mention and the lowest total price we've seen, excluding other eBay vendors. (It's also $31 under the cost of a similar kit sold elsewhere.) It includes two bulbs, two ballasts, and wires necessary for installation. It's available in select sizes from H1 to H13 and from 880 to 9004/9007 and bulb colors from 4,300K to 10,000K.