newegg offers the Rosewill Home Security Indoor Window Alarm Set
, model no. RSHS-11001, for $14.99. Coupon code "RWPA13249" cuts it to $9.99
. With free shipping
, that's tied with our May mention and the lowest total price we could find by $6. The set includes four 100dB window alarms that sound when magnetic contact is broken. Deal ends October 4.