Amazon has an Automatic 12V Portable Digital Air Compressor [amazon.com]
with Auto-Off for $28.07 AC on Amazon when you apply coupon code W6Y6W9V6
- AUTO SHUT OFF allows for safe and unattended operation by turning the compressor off when the target pressure is reached
- RAPID INFLATING in only 4 mins to inflate a fully deflated car tire from 0 to 35 PSI
- EASY OPERATION using the 3 buttons (select unit, choose pressure target, confirm to start inflating). No need for special training.
- LED FLASHLIGHT and BACKLIT DISPLAY allow for safe night-time use (white flashlight mode) and signaling (red strobe mode).
- LONG and COMPACT POWER CORD: 12 feet power cord design allows reaching the rear tires while keeping the unit compact for in-car storage