6pm.com takes up to 76% off select Asics, Nike, and Brooks shoes and accessories, with prices from $8.99. Plus, all orders qualify for free shipping. A couple best bets:
-- Brooks Women's PureDrift Running Shoes for $34.99 (low of $15)
-- Asics Men's GEL-Equation 6 Running Shoes for $39.99 (pictured, low of $20)