Fulllove365 via eBay offers this Universal Magnetic Car Air Vent Smartphone Mount for $1.58 with free shipping. That's tied with our mention from a week ago as the lowest total price we've seen. (Outside of other eBay sellers, it's a current best by $2.) It features two adhesive magnets to mount a smartphone or GPS.

Note: This item ships from Hong Kong and should arrive in three to eight weeks.