Google would love for you to put a Nexus 7 under someone's tree this holiday season, but they also don't want anyone who can't part with $229+ at the moment to feel left out - so they're now offering customers who purchase a Chromecast from Google Play with a free HD movie rental. If Play Movies isn't quite your cup of tea, you're also free to take $6 in Play Store credit instead. You can then spend that money however you like, except on devices or subscriptions.
Like Google's Nexus 7 offer, this deal expires on March 31st, and the free credit must be accepted by that date or it goes to waste. Sure, we're only talking about six bucks here, but it would still be a shame to see that happen. And lastly, this offer is only valid in the US.
Update: It looks like purchases made on Amazon and at Best Buy are eligible as well. Here's what Google has to say about the logistics of receiving promo codes:
I have a question about the Google Play Holiday promotion.
If you purchased your Chromecast from the Google Play Store, Amazon or Best Buy during the Google Play Holiday promotional period, your promotional code will be emailed to you from the retailer once your Chromecast is shipped. If you purchased your Chromecast from a Best Buy retail store during the promotional period, your promotional code will be printed on your receipt.
If you are having trouble redeeming your promotional code, please contact us here or call us at 1-855-466-4438.