Sling TV, Dish Network's live TV streaming service, offers new customers a $50 Best Buy In-Store Credit — valid toward a new Sling TV-compatible device — for free when you sign up for three months of Sling TV service at $20 per month. That's tied with our October mention as the best such promotion we've seen from Sling TV, which features such channels as ESPN, ESPN2, TNT, TBS, Food Network, HGTV, Cartoon Network, and Disney Channel. Compatible devices include select streaming media players, laptops, tablets, mobile phones, and Xbox One.

Note that after the first three months, your credit card will be charged applicable subscription fees each month until you cancel the service.