The Source: Shop It To Me
The Service: Email updates when pieces from your favorite brands are available at reduced prices online ("Salemail"). The site is carefully to only share style left in your size as well, so there's no sad moment when you discover that the shoes of your dreams are 75 percent off and twice the size of your feet.
The Cost: The service is free, but the cost of inevitable impulse purchases are bound to add up.
The Commitment: Aside from submitting their sizes and preferred labels—a five minute process at most—members don't need to do anything.