Nike.com has 20% off their clearance items with coupon code 'MOTION', valid until 5/17. Free shipping if you're logged in.
Men's:
http://store.nike.com/us/en_us/pw/mens-clearance/47Z7pu
Women's:
http://store.nike.com/us/en_us/pw/womens-clearance/47Z7pt
Men's:
http://store.nike.com/us/en_us/pw/mens-clearance/47Z7pu
Women's:
http://store.nike.com/us/en_us/pw/womens-clearance/47Z7pt