One coupon at a time, total needs to be $5 or more, but sounds like close has worked.
Some people have had success with taking several items to the register and having them rung up $5 at a time. Others visit several different check out locations with tools.
I used one tonight to buy a Craftsman 47476 swivel driver and register scan did not accept the coupon, but the kid just marked the item down by $5 and said it was happening all day.
Link to the pdf is still working, so I downloaded it, and plan to keep a couple in my pocket as long as it seems to work, but I am refraining from getting too wild.
I haven't thought of much so far that I don't have and want that $5 off makes hot.