Can someone help me locate a little black dress in New York City?

You would think it were easy to find a little black dress in New York, but its hard there are so many options but I am looking for something more specific. I love this dress from Betsy Johnson http://www.betseyjohnson.com/Burnout_Stripe_Organza_Strapless_Dress/pd/c/1101/np/1101/p/4385.html but I am on a budget can someone recommend something similar for a fraction of the dress? this is for a wedding.