See bottom of post for update.
Brian Atwood's studded Loca pumps are worn by Sarah Jessica Parker in the new Sex & the City 2 movie and retail for $800 at Net-A-Porter.
If you're in love with the Brian Atwood version but you can't stomach the price, Go Jane has an alternative for you! They retail for $29.90 and come in a ton of other colors. Click here to purchase.
*Update - 11/30/10* - This post is originally from back in May, so I believe the Go Jane version listed is sold out. Charlotte Russe just added a look 4 less to their site though and I wanted to share. These pumps retail for $40 and you can click on the photo below if you're interested in purchasing (also available in black). Note: currently Charlotte Russe has a promotion where if you buy one shoe, you get the second for only $15!