Ending today, Crocs takes 25% off sitewide during its Presidents' Day Sale. (Discounts apply in cart.) Shipping adds $4.99, or get free shipping on orders of $24.99 or more. A couple of best bets, with prices after discount and $4.99 for shipping:
REI offers the Merrell Women's Albany Rift Lace Shoes in Coriander or Black/Grey for $49.83. Pad your order to over $50 to bag free shipping. Excluding padding, that's $50 off list and the lowest price we could find. They're available in sizes 6 to 11, although not in all size/color combinations.