For anyone who bought a Roku: I'm seeing that there's a
special offer of $35 towards Sling TV and a free month of Showtime. Both are for new subscribers to those services who activate a new Roku through January 13 (Showtime) or January 23 (Sling TV).
I had nothing whatsoever in my packaging about these offers and just learned about them, but the terms say you need to redeem the Sling offer during initial setup. Which I didn't do.