No problem, I love love love ebay and I by shoes from there all the time. It helps not to narrow your search parameters and make sure to put in the name of the designer versus the name of the actual shoe (it's amazing how some people list the shoes). If you find the shoe in black for example, send an email to the seller to see if they have pink.
Hope you find them for less. Endless.com and Zappos is another great place to find shoes but of course they will more than likely be marked at regular price.