See bottom of post for update.
Miu Miu's Rivet Platform originally retailed for $795, but seem to be sold out online (thanks to Irina from In Their Closet for the info!).
These Vince Camuto cut out booties are incredibly similar as well, for a slightly lower price. They retail for $112 at Lori's Shoes and you can click on the photo below if you're interested in purchasing.
*Update - 7/20/10* - I just spotted another great lookalike for a very budget friendly $32.50. They are available in tan or black, and you can click on the photo below to purchase.