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Terms from the bank website:
M&I Cash Back Checking Special Cash Bonus Offer!
Simply open an M&I Cash Back Checking account by February 12, 2010. To receive your $100 you must make five qualifying** purchases with your M&I Bank Check Card within the first 45 days after account opening. Your account will be reviewed 45 days after opening. The $100 cash bonus will be paid within 2 weeks of that review if the requirement above has been met. Offer applies to new accounts opened with new money not currently on deposit with M&I Bank, no exceptions. One bonus per household ever 12 months. Cannot be combined with other offers.