Wireless streaming services are the most popular way to receive content because it's quick, easy, and wireless. Google has taken this wireless technology and implemented into regular speakers through this Chromecast Audio device that is now on sale for only $30 with free shipping on eBay. Plug this device into the AUX port on your speakers, then cast wirelessly from your phone to play your music through the speakers. The same device sells for $34.99 at Newegg.