B&H Photo has the Chromecast Wireless Audio Dongle for $15 (regularly $35) with Free Shipping for a limited time.

Google through eBay, Best Buy, and Best Buy through Google Express also has their Chromecast Wireless Audio Dongle for $15 (regularly $35) with Free Shipping for a limited time. If you are a new Google Express customer, you can use coupon code: HOLIDAY18 for 20% off for a limited time.

The Chromecast Audio streams your favorite music, audiobook, podcast and more from a compatible device to any speaker with an auxiliary input.