Today's Groupon is a $59 rooftop Cubs ticket at Skybox on Sheffield (3627 N Sheffield). All you can eat and drink is included in the price.
Buy as many as you like for your friends, but these are not for resale.
There are 3 games available - this page is for the Tuesday 4/21 game at 7:05pm vs the Cincinnati Reds.
Read more about today's deal and Skybox on Sheffield here.