Fullness99 via eBay offers this Tire Pressure Indicator Valve Stem Caps 4-Pack for $1.93 with free shipping. That's a slight drop under our December mention and the lowest total price we've seen. (It's a current low by a buck, excluding other eBay vendors.) These caps fit on any standard size tire valve stem and provide visual alerts of each tire's pressure. Deal ends March 21 at 2:40 am ET.

Note: This item ships from mainland China and may take three to eight weeks to arrive.