Buy a $30 Chromecast and Google will give you $20
Well, $20 Worth of Play Credit at Least.

Google announced a new promotion for its Chromecast line on Monday: Buy one of the $30 devices, get $20 in Google Play store credit. What's more, you don't have to buy it directly from Google to qualify for the deal. Pick up one from either Best Buy or Walmart if that's more convenient, you'll still get the twenty dollar rebate after you activate the device.

Tell me why it actually has any value at all and I'll give you all $30.