Amazon offers the Sphero 2.0 App-Controlled Robotic Ball Gaming Device for $89.99 with free shipping. That's $9 below our mention from two weeks ago and the lowest total price we've seen. (It's a current low by $9.) There are more than 30 apps available for this device, and it features a Bluetooth range of up to 50 feet. It's compatible with Windows Phone, iOS, and Android.