(Disclosure, I may receive a small referral fee when you make a purchase through this links on this post.)
Today, Google abruptly ended their 3 month free Netflix promo. It appears even the great minds of Google under estimated the popularity of their Chromecast device. But if you were one of the lucky ones who purchased a Chromecast early on July 24th. Early as in immediately after the announcement, you may be able to get your promo.
If you bought it at an online retailer, you will obtain an e-mail with a 3 month promo code which you can enter it at http://netflix.com/chromecast. If you bought the Chromecast at Best Buy, the promo code will be on your receipt.