Plum and deep purple colored shoes

Now that I'm armed with birthday money, I'm on the hunt for a pair of plum or dark purple colored shoes to match a classic coord I have planned, but deep purple seems to be a really elusive color. The dress itself is a plum color, and while I plan to wear it with cream or black, I need a purple shoe to balance the outfit out and carry the color across the rest of the coord. Does anyone have any suggestions as to where I could find such a shoe? Modcloth's been counted out. No tea-parties, please.