great deal on memberships to the Chicago Architecture Foundation. Beside supporting a great organization, membership includes discounts on bus and Segway tours, buy-one-get-one-free discount on a River Cruise, and other perks. The $55.00 one year-individual tour is going for $25.00, and the one year household membership, usually $75.00, is going for $37.00. As of 6:56 a.m., the deal has already crossed the Groupon minimum threshold of 100 participants, - 71 household memberships, 37 individual. Check it all out here.
UPDATE: As of 11:43 a.m., nearly 1,000 coupons for membership have been sold.