AT&T Wireless offers the iGrill Cooking Thermometer for Apple iPhone, iPad, and iPod touch in White or Black for $59.25 with free shipping. That’s the lowest total price we could find by $21. Sales tax is added where applicable. The iGrill connects to your device via a secure Bluetooth connection and monitors food temperatures in real time. To use the iGrill, you will need to download the free iGrill app.