SJS Commercial via Amazon offers the Honeywell WiFi Thermostat, model no. RTH6580WF, for $86.79 with free shipping. That's $8 under our February mention, and aside from the mention below, the lowest total price we could find by $3. This thermostat can be viewed and controlled via a free app for iPhone, iPad, and Android, and features 7-day programming with four program periods per day, pre-programmed energy savings schedule, and universal compatibility.
A close price: Goodplace2shop via eBay offers this thermostat for $81.95 plus $4.99 for shipping.