Are you in the US or UK? Most of the result I've found are UK based, though there is one retailer in Ohio that mentions stocking these.
Here are the quick results I found off MSN.live & google searches:
(US)
FashionCincy.com - Your Only Online Resource for Fashion in Cincinnati
Plum Diore
(UK)
Buskins Shoe Shop, Gloucesteshire. Shoes, Boots and Bags
http://www.bullfrogs.co.uk/default.aspx?wb=17&g=2&p=0
Stuarts London - katy kiro none
Hope this helps.