firestartoys.com

If you're into Lego minifigures, which we are, then this is a great site for finding all those rare figures to add to your collection. They are expensive, but we have found very few other places with as wide a range of figures. A big part of the cost comes from the fact that they obviously buy and break up sets to obtain specific figures, so you are paying the cost of all the other bits from a set.
They also have a big selection of gear for creating your own custom minifigs and a wide range of other brand minifigs such as BrickArms.