What are the most cost-effective bricks you can use to build a wall?

It depends on where the wall is built. Some places such as brick structure, it can only use red brick.

And for example, it is not important partition wall, you can use perlite bricks, hollow bricks.

That's in the south, the north generally have to do insulation, where the material used by the even do not understand ah, but also depends on where you are in the region oh.