Hi Roz,
I think that if you get the 12" version of the Marbella mules the price has 800 Swiss Francs added. Thats £500 for some shoes!!!
Good luck. I'm sure you can find something much, much cheaper. I would advise you to find an American company as the Dollar is so weak you can get some good bargains.
Have you tried Mr James Shoes?
http://www.deyoproduction.com
The website looks really badly made but the prices are much cheaper especially the sample shoes.
Regards
Ben