Shoes....

Why is it that when someone finds something they like it all of a sudden doesn't exist anymore? Well that is exactly what I am finding out...My sister loves these Mudd shoes (mules) and I have looked everywhere and cannot find them. I have even searched a TON of places online (yes, even ebay) and still cannot locate a pair of shoes even similar to the ones she wants. :( I was hoping to find these shoes for her Birthday surprise but am guessing I need to turn my attention to figure out something else to get for her. Any good birthday present suggestions out there?