Hi LookingNow,
Mountaintop only sells their Continuous pour latex directly (in container loads) or through foam fabricators that sell to mattress manufacturers. If you are looking for the 100% natural version of their Continuous Pour latex then the least costly option I know of is Spindle Mattress here.
They no longer sell the synthetic version and the only place I know that currently sells it is Nest Bedding here but their synthetic is more costly than the 100% natural sold by Spindle.
There are also several sources for the Latexco blended continuous pour Dunlop called Puralux in the component post here. They are usually either a 20% natural/80% synthetic blend or a 50/50 blend.
The component post also includes some good sources for molded 100% natural Dunlop layers and cores as well.
Phoenix