https://www.bitmit.net/en/img/trade_uploads/2012/11/29/spotify-1-month-gift-card_769f3_thumb_gal.jpg

edit: bitmit is apparently down/broken, send PM if you want. Discount 10% for more than 1 card.
1 month = 0,45 BTC = ~$6
12 month = 6 BTC = ~$79