Nova Tech US via Amazon offers the DBPower Portable Mini 12-volt Tire Inflator for $17.99. Coupon code "EYS7EXD9" cuts it to $13.49. With free shipping for Prime members, that's the lowest price we could find by $12. It can inflate a standard mid-sized car tire from 0 to 35 PSI in seven minutes, and comes with three nozzle adapters. Deal ends November 30.