If you'd rather not spend much, these Anne Klein Pumps will fit the bill. It's a popular choice, while not very expensive. Another strong contender for your wardrobe is these Calvin Klein Pumps. While the price of this piece is not too high, it will surely attract a lot of attention. You may also want to look at these Circa Joan & David Pumps. This item is not expensive either, but it will make a difference in your wardrobe.
For something in the middle of the price range, why not take a look at these Diane von Furstenberg Pumps. While the price is very reasonable, this item is an easy wardrobe update.