Woot offers the Tracker Bluetooth Tracking Device 2-Pack for $28.99 plus $5 for shipping. That's $36 off list, $16.99 per device and tied with last week's mention as the lowest total per-unit price we've seen. (For further comparison, we saw a single device for $20 in July.) Each device can track a single item within a 150-foot range. It's compatible with a range of iOS and Android devices. Deal ends October 8.