We went to Washington, D.C. last week. We spent one evening at the mall. They have a LEGO store. You can see “N” of GAIN here with the wall of bricks. Each round container on the wall is full of one kind of brick. You can fill a cup with any of the bricks you want. There are a LOT to choose from.
Most of our time in the store was spent taking a formerly 8′ tall LEGO R2D2 apart. My youngest says that she was so good at sorting the bricks from R2 that she could get paid for her work.