This deal has ended.
When Shoebuy has a large coupon they are one of the better places to get shoes, and through 8/25 they do (use code EMLBTS08 to take 20% off any order). They don't carry Nike but they price other brands very well. For example, the New Balance 992 running shoes for men are $95.16 and women are just $91.96 after the 20% code plus free shipping, free return shipping, and no sales tax. This is the only store under $100 (they retail for $130-$140 and are $140 at this New Balance site).