Coupon Texter

This idea only seems viable in a college town, but I believe it would excel there.  This service would allow users to sign up at no cost for coupons which would be sent via text to their cellphone.  Businesses would sign up for accounts which would allow them to send one message for free, but charge a flat rate per message after that.  These messages would include the type of deal and a coupon code for the deal.  This would allow businesses to deliver coupons to potential customers at times of unexpected low volume.  Since overhead costs are so low almost all coupon sales would be profit.