I received this offer in the mail. It was part of a coupon flyer so it's not targeted. Earn a $75 cashback bonus when you make your first $500 in purchases in the first 3 months. Offer expires May 7, 2010. Invitation code is DACC
You can apply online at www.apply.Discovercard.com
or by phone (1-800-210-9022). Offer for new cardmembers only.
Here's the scan of the offer