Steak ‘n Shake Coupon: BOGO Fresh Banana Shake!! The links in the post below may be affiliate links. Read the full disclosure Here.August 22, 2012 by laurie Leave a CommentSteak ‘n Shake Coupon – Oh, yum!! I wish I wasn’t on a diet!! 🙄There’s a Steak ‘n Shake coupon for Buy One Get One Free Regular Sized Fresh Banana Shakes. The coupon isn’t valid during Happy Hour and expires 8/29.For more COUPON DEALS go hereTo see how you can donate expired coupons to our troops GO HERE If you enjoy the great deals posted by Steals and Deals for Kids, get our FREE Daily Email here filled with our daily deals, and follow us on Facebook here!