Thank you to Julie for emailing me this find!
Ippolita's stack of bangles definitely aren't cheap - with each bracelet retailing for approximately $500 and up.
Henri Bendel has a similar stack of bracelets which retail for $98, still a little pricey but definitely more affordable than the Ippolita bangles above. Click here if you're interested in purchasing.
*Update - 11/4/10* - Another option (although each bangle comes separately) is this version from Lori's Shoes. Each bracelet is $12, so you could still stack a few and it would be the least expensive option. Click on the photo below if you're interested in purchasing.