As one of its daily deals, iTech Deals offers the iFi Systems Bluetooth Smart Tag for iPhone / iPad for $5.99 with free shipping. Outside of the price below, that's the lowest total price we could find by $14. It can be used to keep track of your keys and other items, alerts when your phone and the tag are separated, and provides email notification with GPS coordinates of a lost item. Via the free "I Found It" app, it's compatible with the iPhone 4/4S/5/5S/5C or iPad 3/4/Air/mini. Deal ends August 28 at 12 pm ET.
A close price, Deal Based via eBay offers it for $6.99 with free shipping.