Walgreens: Possible $3/$15 Coupon With Your Flu Shot

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When I was out tonight I noticed the marquee in front of our Walgreens Store:  “Get a $3 off of $15 coupon with your flu shot.”  While it is possible that this is just an offer at my local store, it might be worth checking out at the one where you shop.  If you plan on getting your shot – why not get a coupon in return?