I found a pair on ebay but the auction already ended . Maybe set up an alert there so if any others come up you'll be notified?
Have you taken your shoes in to see if they could be repaired? If the heel snapped off where it meets the rest of the shoe, it could probably be (professsionaly) glued and nailed back into place ....
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To be yourself in a world that is constantly trying to make you something else is the greatest accomplishment ~ {Ralph Waldo Emerson}