Spotify offers a yearly premium subscription for $99 ($20 off)
The offer is available from now until the end of the year and is available to to existing subscribers as an "upgrade" option, as well as to new users. The only caveat of the deal, Engadget notes, is that it seems to be unavailable to users enrolled in a Spotify family plan, and it also can't be canceled after the usual 14-day period.
Other than that, if you're a heavy Spotify user, you might want to check out the deal by clicking the source link below.
source: Spotify via Engadget
Things that are NOT allowed: