See bottom of post for update.
Prada's perforated "butterfly" platform sandal retailed for $795 but seems to be sold out online.
On a budget? Check out BCBGeneration's Alana sandal which is a great option for only $59.40 (with an additional 10% off) at Bluefly. Click on the photo below for more information or to purchase.
*Update - 1/26/11* - I just spotted another great option for less from Miss Me, which retail for $42.95 and also come in white, brown, or grey. Click on the photo below for more information.