Microsoft Store offers the Sphero 2.0 App-Controlled Robotic Ball Gaming Device for $99 with free shipping. Aside from the mention below, that's the lowest total price we could find by $11. 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.

Of note, ShopTronics via Amazon offers it for $99.99 with free shipping.