Shop It To Me is like having a personal shopper. Choose from at least 900 top brands. Fill out information on your size and select designers and brands you love. You decide how often you want to receive custom-tailored sale information directly to your email inbox.
They do limit their list to top-quality retailers. I requested daily emails and I am really happy with the information they have sent me, (I should be, it is what I asked for), great deals that I didn't have to search the internet for.
I guess the only downside could be that you may have to act quickly as I am sure they must have a large customer base due to being named one of the "Best 50 Websites 2012".
IPhone users will be happy to know that there is an app!