REI cuts up to 70% off a selection of men's, women's, and kids' running gear, with prices starting from $2.73. Opt for in-store pickup to dodge the $5.99 shipping charge, or get free shipping on orders of $50 or more. Some sizes are limited. A couple of best bets, both with free shipping:
6pm offers the prAna Women's Margo Sweater in Winter or Henna for $35.99 plus $4.95 for shipping. That's the lowest total price we could find by $3. It's available in sizes XS to XL, although not in all size/color combinations.