The cash back is paid in the form of SB points on Swagbucks, which you can turn into free gift cards to places like Amazon, Starbucks, or PayPal. You can take advantage of this deal by clicking here, and if you don't already have a Swagbucks account, you can create one there so you get your SB points for your purchase!
This is a limited time offer that's good through this April 30th or until supplies run out, whichever happens first! Steak 'N Shake is known for steakburgers and milkshakes... so (if you love burgers and milkshakes) this is another win-win situation... get cashback in addition to enjoying Steak 'N Shake!