Get a one-year Chicago Tribune Sunday subscription for $8 or a two-year subscription for $16 with this Groupon promotion when you also throw in promo code EXTRA20; each subscription includes full digital access.  Valid only for new customers or not subscribed in past 30 days, which is pretty decent if you’ve never tried a subscription or let it lapse over 30 days ago.  Remember, this promo code is only valid today!