FootSmart has the following coupon codes through 4/30:

Free Shipping on $60+ orders with coupon code WB999631 [Exp 4/30]

20% off plus Flat 4.95 shipping with coupon code WB999640 [Exp 4/30]

Free FedEx Home Delivery Upgrade (standard shipping) code WB999634 [Exp 4/30]

10% Off Slippers with coupon code WB999630 [Exp 4/30]

Link (http://www.footsmart.com/default.aspx)