Has anyone heard of shopittome.com? I just signed up, but here's how it works:

What is Shop It To Me?
You can think of Shop It To Me as your free personal online shopper. Select your favorite apparel brands (such as Theory, Prada, Armani, Ella Moss, Juicy Couture, Seven Jeans, DKNY, or BCBG) and sizes. We'll scour the websites of leading retailers like Nordstrom, Saks Fifth Avenue, Bloomingdales, Banana Republic, Gap, Zappos and Bluefly and send you a Salemail™ - a daily or weekly email summary of which new items go on sale in your size.