I've been trying to snag one of these free cardboard viewers for most of 2015 with no luck. They've been given away by random companies and tied to the weirdest promotions, but so many people want them that supplies tend to exhaust within hours. Luckily Google seems to have a ton of Star Wars themed viewers available today!
If you're not familiar with cardboard viewers, they're designed for new Android and ioS smartphones to fit inside them. You then put the viewer on your face and, paired with video shot on a specific type of camera, are treated to a cool, semi-VR video experience. It sounds stupid, but people I've talked to who have tried it out swear it's neat. The New York Times even tried some VR-content this past autumn and it was a big hit.
You'll need a credit card on file with the Google Play store to request one of these, but the final charge should say $0.00.