Shopping at SammyDress is interesting. The prices are low so that you are tempted to buy everything, but of course that's not possible. Also, there's a tiny catch: Shipping is not free, and since they ship from overseas, it naturally takes time for the items to reach you. Also, beware that your country's customs laws can really add a lot to the cost.
What I do is to order one or two items at a time to stay below the import tax threshold. That way I don't have any additional costs when the package arrives.
So impulse buying something that you need right now won't work, but if you plan ahead, shopping here is really great and can save you lots of money.