Don't know if this has been posted but I just got this in my inbox and figured I'd send it along.
Here's how you can get $20 OFF an Annual Membership that gives you access to 1000s of bikes at 100s of stations across the city.
To receive your $55 discounted Annual Membership (regularly $75), please email firstname.lastname@example.org with "Divvy IL Discount" in the subject line and we will email you a gift certificate code to use at DivvyBikes.com/signup at checkout. Offer ends August 31, 2013, so get your Membership today!
I have emailed and received a code but haven't confirmed that the code works at checkout.