So I did a little digging around and discovered Nine West's "Smooch" Wedge Pump for $79 at piperlime.com. It's a close match in black patent leather and round toe but it has a 4" heel, so be aware.
Another option that will give you the Kate Spade look-for-less is from Jones New York. Their "Kent" wedge pumps are $59.95 at dsw.com and have a genuine leather upper and 3" heel (just like the Kate Spades, although it's tough to tell from the photos).
Lastly, we have Merona's Myka Suede Wedge Pumps featuring a 2-inch heel that's great for walking. These are just $29.99 at target.com. Take your pick!