Anrui via Amazon offers its Anrui 120dB SOS Emergency Personal Alarm 3-Pack for $18.99 $17.88. Coupon code "QFH7WMGZ" cuts that to $12.91 $12.16. Plus, Prime members bag free shipping. That's around $12 less than what you'd expect to pay with most other third-party sellers. It activates for up to 40 minutes of continuous sound. Deal ends November 14.