Home Depot offers the second-generation Philips Hue White and Color Ambiance A19 Starter Kit, model no. 456194, for $174 with free shipping. (Adorama charges the same.) Outside of the mention below, that's the lowest total price we could find by $26. Controlled via iOS or Android app, it's capable of producing millions of colors and shades of white. It includes three dimmable light bulbs and the Hue bridge.
A close price: Several stores charge a buck more, including Sears, Best Buy via eBay, Amazon, and B&H Photo Video.