This deal has ended.
When Shoebuy has a 20% off coupon they are one of the best places to buy shoes. And right now they do (use code BLOWOUT06), through 12/11. They don't carry Nike but price other brands very well. For example, they have the men's New Balance 992 running shoes for $91.16 after the 20% off code plus free shipping and no sales tax too. This is the only store under $100 (they retail for $130-$140 and are $135 at this New Balance site). The 992 for women at Shoebuy are $94 after the coupon. Also of note: return shipping is free at Shoebuy so don't worry about sizing, just buy 2.