By now I'm sure you're familiar with the way flash sale sites work; however, I'm going to give you a brief run through.
Flash sale sites like livingsocial and GILT (and Fab) offer things for a discount price (usually anywhere between 20-70% off original value) for a limited amount of time until all of the products (and even activity and vacation packages) are sold out.
Fab.com is another flash sale site, but focuses on lifestyle, fashion, and home products. They showcase some of the lesser known designers (so don't expect to see bow-down brands you're familiar with).
Sooooo... Deal or Spiel?
I've ordered from Fab, sometimes they can take some time to deliver. On the bright side, there are many good savings to be had. The surprises keep coming. Top hats as lighting fixtures? Who really saw that one coming? Shipping is usually around $5, depending on the size of what's being shipped. Fab has proven to offer the new and edgy of just about everything. I would say this site is the real DEAL.