Hittime_SG via eBay offers this GPS Bluetooth 4.0 Tracker for $2.30 with free shipping. That's tied with last week's mention as the lowest total price we've seen. (It's also a current low by $6, outside of other eBay sellers.) It can be attached to an item so that it can be located within a 75-foot range via your iPhone or Android smartphone.

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Note: This item ships from Hong Kong and may take two to eight weeks to arrive.