ASTOW and LCLARK in all caps appear to give 5% and they're supposed to be stack-able...maybe if you stack 'em both you'll get 10% off???
Right now (at least yesterday) I saw buy one get one 50% off storewide, plus if you sign up for their daily email, there are specials (with very large discounts) on a variety of shoes. It may be a longshot but if your shoe style goes on sale, it's worth getting the emails. Good luck!