Don't forget that kohls.com will allow you to stack as many as four promo codes at once. I never buy anything in store anymore.
The $10 off $30 for kids can be reused as many times as you like, so divide your back-to-school purchase into $30 increments. You'll save $10 off each one. Use the AUGMVC promo code to give you free shipping off each one (no minimum purchase). Then stack on the 30% off code. A couple of weeks ago, they had an additional $10 off $50 code which stacked with the $10 off $30 menswear purchase.
There's a $10 off $40 intimates (INTIMATES10) that will stack with the 30%, but I don't see two $10 codes that can be used together right now.
The downside to stacking coupons and making separate purchases of $30 (that's the before-discount price) is that you won't quality for Kohls cash. But I don't like Kohl's cash -- too much uncertainty when you need to make a return. Besides, the stacked promo codes are better in the long run. (For instance, $30 in Kohl's cash for a $150 purchase -- but $50 in promo code discounts for the same $150.)
Target is allowing stacked codes, too.