If you're on a thrifty mission, your best bet is these Frye Sandals. It's a popular product, while not very costly. Another great option is these Joie Sandals. While the price is rather reasonable, be sure that this product will become a worthy addition to your wardrobe.
If you're looking for an item in the middle of the price range, look no further than these Cole Haan Ballerina Flats. This item won't break the bank, but absolutely indispensable in your wardrobe.