As of 2015, Schrader tire pressure gauges are available from Amazon.com and the website for the Tyre Equipment Company. Additional vintage tire pressure gauges are available at Etsy.com. Schrader tire pressure gauges for bicycles are also available at Jet.com.
As of 2015, the Tyre Equipment Company offers a variety of Schrader tire pressure gauges for people in the United Kingdom. Digital and dial-based tire inflation gauges are available.
Amazon.com sells a hybrid Presta and Schrader digital pressure gauge, although it appears the pressure gauge is primarily intended to measure the tire pressure of bicycles. Amazon.com also sells a Schrader universal tire pressure gauge, which is a vintage product from 1922. Etsy.com also sells some vintage Schrader tire pressure gauges.
Jet.com also sells dial-based Schrader pressure gauges, measuring pressure up to 160 PSI. It also appears that it is intended for use as a bicycle gauge.