Woot offers Philips Hue Play White & Color Smart Light Extension: Hub Required (No Power Supply Included) for $34.99 (reg. $79.99) free shipping with Prime. 

Product Description: 
Extend your existing Hue Play light bar setup with the Play White and color ambiance light bar extension pack. This extension pack includes 1 color changing light bar and mounting hardware. Requires a Play light bar base kit with power supply (sold separately).