I went to the Blizzard Fan Club Website just now. I entered my information and voila - a BOGO Blizzard Coupon popped up in my mailbox. The technical part of the coupon is "Buy a medium blizzard, get a mini, small or medium for free." Free is free however, and my family loves Blizzards.
I usually frequent the Quincy Dairy Queen. They don't take part in national promos like this though. So I'll have to slum it on over to the Weymouth Dairy Queen to redeem my coupon.