See bottom of post for update.
Alexander Wang's lace up bootie retails for $905 at Brown's Fashion.
NYLA's Frissy bootie will give you a very similar style for a fraction of the price. They retail for $84.95 at DSW (also available in ivory) and you can click on the photo below to purchase.
Kelsi Dagger has a similar bootie as well which retails for $179.95 at Endless (also available in red). Click on the photo below to purchase (also available at Piperlime).
*Update - 7/31/10* - Reader Mollie wrote me awhile ago with another alternative to the Alexander Wang Freja bootie, which is currently on sale for $149.99 at Piperlime (also available at Endless or Revolve). Click on the photo below to purchase.