Campus111 via eBay offers this HID 4300K 55-watt Xenon Headlight Conversion Kit for $19.99 with free shipping. That's $3 under our mention from last week and $20 under the lowest total price we could find for a similar kit elsewhere. It includes two bulbs, two ballasts, and necessary wires for installation. It's available in eight sizes, from H1 to H8/H9/H11. Deal ends October 29 at 11am ET.
Of note, it's also available in 6000K, 8000K, or 10000K for $1 more.