Roger Vivier's classic buckle flats retail for $362 at Far Fetch and are a favorite of celebrities like Katie Holmes and Jessica Biel. (Photo credit/Photo credit)
Beverly Feldman's Surprise Buckle ballet flat will give you an almost identical style to the Roger Vivier flats for a much lower price. They retail for $92.37 (and also come in two other colors) and you can click here to purchase.
*Update - 11/16/10* - Nine West also has a great option which retails for $99. Click on the photo below if you're interested in purchasing;