Master product pricing
"Low as price" is driven from the first 3 simple products listed in the configurator.
The system will start at the top and will find the first product that is available (in the catalog container) for the customer that is logged-in.
It will then deliver the price of that products as the "Low as price".
This means that you should arrange your first 3 products in the order of lowest price at the top followed by the next lowest, etc.
Keywords - master products, simple products, remove configurable products