StackSocial offers the Sensordrone for Smartphone or Tablet for $149 plus $6.22 for shipping. That's the lowest total price we could find by $20 and just pennies more than our September mention. It turns your handheld device into a "mobile, wearable, programmable, sensing computer" via Bluetooth connectivity. The Sensordrone features sensors for gas, light, humidity, and temperature. Deal ends February 5.