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]
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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