Best Buy has the Samsung SmartThings ADT Motion Detector (F-ADT-PIR-1) for $4.99 with free in-store pickup or $5 shipping to home (free on $35+). Requires a SmartThings ADT Security Starter Kit (F-ADT-STR-KT-1), sold separately.

The Samsung SmartThings ADT Smart Smoke Alarm (F-ADT-SMK-1) is $9.99 w/ free pickup.