This is the page about the Cubic Store.
In the Cubic Store you can buy Clothes, Blocks, Rooms, Realms, (like you gain in the start/Realm), and Items.
There are also special packs you can buy , that include all the sets and parts of that type (they are the mini icons).
In the bottom left of the store, you can see your cubits.
The Cubit Store was recently updated and has an entirely new look to it. There is also a new category (Recycling).
The Cubit Store was updated again to get cars in the Wheels section