6pm is great for lower prices, but since they get mostly "end of the season" merchandise, they don't always have every size left.
I only order from 6pm when I'm absolutely certain I'm going to keep the item, because you pay for shipping both ways if you have to return something. However, if you find something you know you love, and you know it will fit - the price is usually great. (Just calculate in the $7.00 shipping.) And -- they do often have items that are fairly current. They're great, too, for searching for something you saw a while ago but suddenly decide you have to have!