Hittime_3c via eBay offers the Rotating Smartphone / GPS Car Mount in White for $1.12 with free shipping. (It's also offered in three other colors for a few cents more.) That's tied with last week's mention and the lowest total price we could find for a similar mount by a buck. It features a rotating clip that attaches to most air vents.

Note that this item ships from China with an estimated shipping time of two to eight weeks.