Fashion_Key via eBay offers this Universal Magnetic Car Air Vent Smartphone Mount in Black or Blue for $1.18 with free shipping. That's slightly below last week's mention and the lowest total price we've seen. (It's the best deal now by a buck, outside of other eBay sellers.) It includes a magnetic air vent mount and two universal metal plates.

Note: This ships from Hong Kong and may take up to eight weeks to arrive.