Rakuten takes an extra 20% off a selection of apparel, shoes, and accessories via coupon code "APPAREL20". (It's applicable for up to $30 off.) Plus, most orders receive free shipping. A couple of best bets, with prices after coupon: PUMA Men's Carson 2 X Running Shoes for $27.99 (pictured, low by $10) ASICS Women's GEL-Kahana 8 Running Shoes for $31.99 (low by $18)
None of these moves requires a big investment, and they all can save you money.