The Nike Store  is currently running a great clearance sale. You can also use the coupon code RUNPRERUN to save an additional 25% off clearance items. Shipping starts at $8 or you can sign-up for their e-mail list  to get free shipping on all orders over $100.
Don’t forget to also go through Ebates  and you’ll be able to snag 6% cashback on your order. If you are brand new to Ebates you will also be able to get a $5 credit on your Ebates account. Don’t forget, once your Ebates cashback balance reaches $5.01 they will send you a check in the mail! This $5 exclues the $5 sign-up bonus.