Groupon offers Chicago residents a $40 Google Express Credit for $15 for new customers only. (Check availability for your ZIP code here.) That's tied with our mention from a month ago, a $25 savings, and one of the best deals we've seen for a Google Express credit. Google Express is a delivery service that allows you to order from local grocers and retailers like Walgreens and Costco.

Note that the promotional value expires on January 31.