Amazon offers its Amazon Prime members the GE Smart Home Wireless Alarm System Kit
, model no. 51107, for $21
with free shipping
. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $5.34.) That's $2 under our mention from five weeks ago and the lowest total price we could find by $8. It features three 120-decibel window alarms and a door alarm with 4-digit keypad.
Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months. (Note that there is currently a wait list for the Amazon Mom program.)